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Who are the hackers behind the reported campaign?
The actor named in SecurityWeek’s 25 August 2025 report is APT36, also known as Transparent Tribe. MITRE ATT&CK lists the group as G0134 and records the aliases COPPER FIELDSTONE, Mythic Leopard, and ProjectM. MITRE describes it as a suspected Pakistan-based group active since at least 2013, primarily targeting diplomatic, defense, and research organizations in India and Afghanistan.
“Pakistan-linked” or “suspected Pakistan-based” is the appropriate qualification: these are public threat-intelligence assessments, not a court finding. RUSI characterizes Transparent Tribe as a persistent threat to Indian government and defense-affiliated entities, with an espionage interest in information relevant to Pakistani military and diplomatic concerns.
How did the Linux phishing campaign work?
- Use a plausible meeting lure. The August 2025 campaign used phishing emails framed as meeting notices to persuade recipients to interact with delivered material.
- Abuse a Linux desktop entry. The emails involved Linux
.desktopfiles, a desktop-entry format that can launch an application or command. In this campaign, SecurityWeek described the files as loaders: if a recipient treated one as a legitimate meeting-related file and launched it, it could help start the malware delivery process. - Use Google Drive in the attack lifecycle. SecurityWeek quoted CloudSEK saying the group’s use of Google Drive represented an evolution in its approach. The public account does not specify enough to establish Google Drive’s exact role at each stage, or to reconstruct a complete command-and-control chain.
This is a social-engineering and execution risk, not evidence that Linux itself was exploited or that all Linux systems automatically run a downloaded .desktop file. The reported adaptation is notable because the lure and loader were suited to the target’s Linux environment; it does not establish that APT36 has stopped targeting other operating systems.
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What organizations and users should do
The campaign’s reported entry point makes handling unexpected meeting files a practical priority. Linux organizations should treat desktop-entry files received by email or shared links as executable content, not as ordinary documents.
- Confirm unexpected meeting notices with the purported sender through a known channel before opening or launching attachments.
- Do not launch an unfamiliar
.desktopfile to preview its contents. If it needs investigation, route it to the organization’s security team. - Use endpoint controls and monitoring to review unexpected launches from user-writable locations, especially when followed by unusual script, network, or file activity.
- Review access to cloud-storage services in context rather than assuming a familiar service makes a file trustworthy. Google Drive’s presence in an attack path does not, by itself, prove a file is malicious.
- If a file was launched unexpectedly, report it promptly and preserve the message and relevant endpoint records for incident response.
How this activity fits the wider India-Pakistan cyber context
The August campaign came amid heightened cyber activity following the Pahalgam attack and Operation Sindoor in May 2025. RUSI and Indian policy reporting described a wider mix of phishing, fake domains, malware delivery, denial-of-service activity, and information operations. That context matters, but it should not be conflated with attribution of the specific Linux campaign: the August report identifies APT36, while the broader activity involved multiple actors and techniques.
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Reported attack totals also refer to separate assessments, not a single standardized or independently audited count. RUSI relayed a Maharashtra Cyber assessment of more than 1.5 million cyberattacks after the Pahalgam attack. ICWA separately reported Maharashtra Cyber’s assessment that seven APT groups were behind more than 15 lakh attacks on critical-infrastructure websites, with 150 described as successful. Those figures have different descriptions and are attributed to Maharashtra Cyber through the respective publications; they do not show that APT36 was responsible for all, or any particular share, of the totals.
Timeline of reported activity
| Date | What was reported | What it establishes |
|---|---|---|
| Since at least 2013 | MITRE ATT&CK records Transparent Tribe activity targeting diplomatic, defense, and research organizations in India and Afghanistan. | A long-running targeting pattern, not proof that every later incident is attributable to the group. |
| 27 May 2024 | A DRDO-hosted news digest summarized reporting that Transparent Tribe targeted Indian defense-establishment employees and firms connected to the Department of Defence Production. | Prior reporting on defense-related targets; it is distinct from the 2025 Linux campaign. |
| May–June 2025 | RUSI and Indian policy sources described cyber operations occurring alongside the crisis after Pahalgam and Operation Sindoor, including fake domains, malware, and DDoS activity. | A broader period of reported operations involving more than the APT36 campaign. |
| August 2025 | SecurityWeek reported APT36’s meeting-themed phishing and Linux .desktop-file campaign against Indian government entities. |
The specific campaign at the center of this article. |
| 15 September 2025 | India Today described an “OP Sindoor Lessons For Action” PDF lure aimed at Linux systems used by government agencies and linked the technique to APT36. | A later report of a related Linux-focused lure; it does not, by itself, prove that the same infrastructure or operation was involved. |
| January 2026 | CSIS recorded another Pakistan-aligned APT36 campaign targeting Indian government, academic, and strategic institutions for data exfiltration and persistent surveillance. | Public reporting continued to describe APT36 activity after the August 2025 incident. |
What is known—and what remains unproven
The public reporting supports a clear account of the campaign’s broad approach: meeting-themed phishing, Linux desktop-entry files used as loaders, and Google Drive somewhere in the attack lifecycle. It does not provide a complete technical chain, a verified victim count, or a standardized measure of success. The broader crisis-era attack totals should not be treated as APT36 statistics. As of the latest dated reporting covered here, CSIS’s January 2026 timeline indicates continued attribution of activity to APT36, but it does not establish the group’s current operational status beyond that report.
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