Full Report
The russia-linked Gamaredon APT notorious for a wealth of cyber-offensive operations against Ukraine resurfaces in the cyber threat arena. The ongoing Gamaredon adversary campaign against Ukraine leverages malicious LNK files disguised as war-related lures to deploy the Remcos backdoor and applies sophisticated techniques, such as DLL sideloading. Detect Gamaredon Group Attacks The russia-affiliated hacking groups […] The post Gamaredon Campaign Detection: russia-backed APT Group Targets Ukraine Using LNK Files to Spread Remcos Backdoor appeared first on SOC Prime.
Analysis Summary
# Threat Actor: Gamaredon (Attributed to Russia)
## Attribution & Identity
* **Identification:** Identified as a Russia-backed Advanced Persistent Threat (APT) group.
* **Aliases/Associations:** Explicitly referred to as "Gamaredon Group."
## Activity Summary
The latest activity involves a campaign specifically targeting Ukraine, leveraging geopolitical themes in phishing lures. This campaign is designed to spread the Remcos Backdoor. The attack chain starts with phishing emails (likely containing ZIP attachments or links to download them) leading to the deployment of LNK files.
## Tactics, Techniques & Procedures
* **Initial Access/Execution:** Use of **LNK files** initiated via phishing.
* **Defense Evasion/Execution:** Exploitation of legitimate applications to load a malicious **DLL via sideloading** after extracting content to the `%TEMP%` folder.
* **Execution/Evasion:** Use of the **`Get-Command` cmdlet** to bypass string-based detection.
* **Payload Delivery:** Payloads are delivered via ZIP archives.
* **Command and Control (C2):** Payload servers are geographically restricted, restricting access only to Ukrainian victims (geo-fenced).
* **Metadata Analysis:** Metadata analysis of LNK files suggests activity originated from only two machines, consistent with previous Gamaredon tactics.
## Targeting
* **Sectors:** Not explicitly detailed beyond the geographical focus, but the nature of APT activity implies governmental or critical entities are likely targets.
* **Geography:** **Ukraine** is the specific focus of this latest campaign.
* **Victims:** Ukrainian targets are the explicit focus of the geo-fenced servers.
## Tools & Infrastructure
* **Malware Families Used:** **Remcos Backdoor** (The final payload).
* **Infrastructure:** Payload servers based in **Germany and russia**. These servers restrict access geographically.
## Implications
Gamaredon continues to actively target Ukraine amidst geopolitical unrest, employing advanced techniques such as DLL sideloading and geo-fencing for C2 infrastructure to enhance evasion and specifically focus their attacks. This indicates a persistent, well-resourced threat actor maintaining operational security.
## Mitigations
Organizations should focus on strengthening defenses against file-based execution delivered via phishing, specifically monitoring for:
* LNK file execution.
* Suspicious activity in the `%TEMP%` directory involving ZIP extraction, DLL loading, or sideloading from legitimate applications.
* Detection or blocking of the use of cmdlets like `Get-Command` in obfuscated execution chains.
* Implementing controls to block/inspect traffic to potential C2 infrastructure exhibiting geo-fencing behavior.