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An Iran-linked espionage cluster tracked as Greenbug and OilRig/APT34 targeted telecommunications providers in South Asia while relying on a broader toolkit built for stealthy persistence, credential theft, and covert command-and-control. Symantec reported intrusions spanning at least April 2019 to April 2020 in which attackers used email lures and malicious CHM and HTA files for initial access, then moved through victim networks with tools including Covenant, Cobalt Strike, Mimikatz, Plink, Bitvise, PowerShell, BITSAdmin, and webshells. In one intrusion that lasted about six months, the operators focused on harvesting credentials, maintaining privileged access, tunneling into internal systems, and testing access to database servers inside telecom environments.
Multiple reports tie that activity to established OilRig tradecraft, including Exchange-focused .NET webshells planted under /owa/auth/, scheduled-task persistence, and extensive use of DNS tunneling to hide C2 and exfiltration traffic. Unit 42 and IronNet described tools such as ISMAgent, Helminth, ALMACommunicator, BONDUPDATER, QUADAGENT, and PoisonFrog, which encoded tasking and stolen data into crafted DNS subdomains and used A, AAAA, or TXT responses to pass commands. NSFOCUS said a leaked APT34 toolkit exposed PowerShell RATs, webshells, the Webmask DNS/HTTP hijacking tool, and more than 12,000 weak passwords, while earlier ClearSky reporting showed Greenbug delivering ISMAgent through an Office exploit for CVE-2017-0199 and certutil.exe-decoded payloads, underscoring a long-running pattern of low-profile access operations and intelligence collection.
TTPs, infrastructure, and targeting history in one profile.
17 events from the most recent confirmed update back to the earliest known activity.
On April 13, 2020, attackers used PowerShell to run whoami, netstat -a, arp -a, and another database connectivity test on the compromised telecom environment.
On April 8, 2020, attackers used PowerShell to download additional payloads from 185.205.210.46 during the telecom intrusion.
Symantec reported that Greenbug espionage activity against telecommunications companies in South Asia was observed as recently as April 2020, using email lures, malicious CHM/HTA files, public offensive tools, and living-off-the-land techniques.
On March 11, 2020, the attackers used PowerShell and SQL commands to connect to a database server and query @@version to verify access using stolen credentials.
On March 4, 2020, the attackers used WMI and then executed Mimikatz from the victim's documents directory to steal credentials.
On February 14 and 15, 2020, the attackers connected to the exposed port, enumerated users and drives, and added a user account on the victim system.
On February 12, 2020, attackers executed pls.exe and used ncat.exe to bind cmd.exe to listening port 8989 on a compromised machine.
On February 6, 2020, attackers executed PowerShell after w3wp.exe, suggesting possible webshell use, then searched for web.config files and decrypted connectionStrings with aspnet_regiis.exe to recover credentials.
On October 11, 2019, attackers executed a malicious PowerShell command to install a Cobalt Strike Beacon module during one documented Greenbug intrusion into a South Asian telecom organization.
Symantec described one case in which Greenbug maintained access to a victim organization from October 2019 to April 2020 while stealing credentials, moving internally, and testing access to database servers.
On April 18, 2019, a toolkit attributed to APT34/OilRig was sold on a Telegram channel under the false name "Lab Dookhtegan," exposing PowerShell RATs, webshells, and the Webmask tool.
Symantec assessed that at least one telecommunications victim in South Asia appears to have been first targeted as early as April 2019 as part of the Greenbug espionage campaign.
NSFOCUS reported that a toolkit attributed to APT34/OilRig had already been released and sold online in mid-March 2019 under the false name "Lab Dookhtegan."
Unit 42 said it had tracked OilRig since early 2016. NSFOCUS also cited a FireEye report from November 4, 2017 stating that APT34 exploited CVE-2017-11882 using tools similar to those later leaked.
Symantec said its 2017 research found evidence that Greenbug was present on an organization's network prior to a wiping attack involving W32.Disttrack.B (Shamoon), suggesting a possible but unproven connection between the actors.
Unit 42 reported that the Iran-nexus threat group OilRig had used DNS tunneling in operations since at least May 2016 across multiple custom tools.
ClearSky documented a GreenBug campaign using a malicious Office document named "change managment.dot" that exploited CVE-2017-0199, fetched a remote RTF, and ultimately decoded an ISMAgent payload with certutil.exe.
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Researchers tied multiple 2017 intrusion campaigns to the Iranian threat activity tracked as **Greenbug** and **OilRig**, linking them through shared malware, infrastructure, and targeting patterns. Palo Alto Networks reported OilRig using an **ISMDoor** variant possibly connected to Greenbug, while ClearSky later identified a broader infrastructure set built around lookalike domains impersonating Israeli high-tech and cybersecurity firms, as well as a Saudi industrial company. ClearSky said a sample named `WmiPrv.tmp` submitted from Iraq used command-and-control domains including `thetaraysecurityupdate[.]com` and `securepackupdater[.]com`, and additional domains, IPs, hashes, and an SSL certificate suggested further preparation for targeting related organizations or third parties. A separate campaign attributed to OilRig hit numerous Israeli organizations with malicious Microsoft Word documents sent from compromised Ben-Gurion University email accounts. The documents exploited **`CVE-2017-0199`** to launch **HTA** payloads through `mshta.exe` and install a fileless **Helminth** Trojan variant, affecting high-tech, medical, and education entities and reaching more than 250 individuals, according to CERT-IL. The operation used command-and-control infrastructure including `vpsupdate[.]tk`, `alenupdate[.]info`, and `maralen[.]tk`, and maintained persistence with scheduled tasks disguised as Google update jobs while deploying customized Mimikatz-based batch scripts for reconnaissance and credential theft.
Aug 15, 2026
Iran-linked threat group **OilRig** (also tracked as **APT34**, **Crambus**, and in some reporting linked with **Lyceum/Hexane**) has conducted a long-running cyberespionage campaign against government, diplomatic, technology, medical, energy, and utility targets across the Middle East and nearby regions. Researchers tied the group to spear-phishing operations that used compromised business email accounts, fake **University of Oxford** conference and job sites, trojanized VPN installers, and malicious Office documents to deliver malware including **Helminth**, **ALMA Communicator**, **Marlin**, and other custom backdoors. In one notable case, malware was digitally signed with a legitimate **AI Squared** code-signing certificate, making the payloads appear trustworthy and highlighting either certificate theft or compromise. The intrusions evolved into deeper post-compromise operations featuring credential theft, webshell deployment, lateral movement, and covert command-and-control. Reports described OilRig-linked operators using **Mimikatz**, **PsExec**, **Plink**, scheduled tasks, SSH tunnels, spoofed webmail portals, and IIS backdoors such as **RGDoor**, while newer tradecraft included **DNS tunneling**, **OneDrive API** communications, and the **PowerExchange** technique that abused a compromised Exchange mailbox for C2. A later campaign against a Middle Eastern government reportedly compromised at least 12 systems, stole files and passwords, enabled remote RDP access, and deployed malware families including **Backdoor.Tokel**, **Trojan.Dirps**, and **Infostealer.Clipog**, underscoring that OilRig remains an active and adaptable Iranian espionage threat.
Aug 15, 2026
Iran-linked **MuddyWater** (also tracked as **Seedworm**) was tied to an espionage campaign that compromised at least nine organizations across nine countries and four continents, hitting sectors including manufacturing, education, government, financial services, professional services, telecommunications, and an international airport. Researchers said the group used **DLL side-loading** with legitimate signed binaries such as `fmapp.exe` from Fortemedia and `sentinelmemoryscanner.exe` from SentinelOne to launch malicious DLLs, including the open-source **ChromElevator** tool for browser-data theft. One confirmed victim was a major South Korean electronics manufacturer, where the attackers reportedly maintained access for about a week, while earlier activity also targeted telecom providers in Egypt, Sudan, and Tanzania. The operators combined stealthy execution with a broad post-compromise toolkit, using **Node.js** to launch PowerShell payloads for reconnaissance, screenshot capture, privilege escalation, credential theft, and SOCKS5 reverse-proxy tunneling. Symantec also linked MuddyWater to the **MuddyC2Go** PowerShell framework, use of legitimate remote-management software **SimpleHelp**, and the publicly available **Venom Proxy** to maintain access and move through victim networks. Persistence was established through registry modifications, credentials were harvested through fake login prompts and registry hive dumping, and stolen data was exfiltrated via the public file-transfer service `sendit[.]sh`, indicating a sustained intelligence-collection effort aligned with Iranian state interests.
Jun 29, 2026