⚠️ Overview

DarkShell is a modular remote access trojan (RAT) first documented by Trend Micro in November 2021, attributed to the Chinese cyber espionage group TA428 (also tracked as RedDelta or APT40). It is categorized as a backdoor that enables persistent remote control and data exfiltration, primarily targeting government and critical infrastructure entities in Southeast Asia and the Middle East.

🔧 Technical Capabilities

DarkShell uses dynamic-link library (DLL) side-loading for initial execution, typically leveraging legitimate signed binaries such as chrome.exe or 7z.exe to evade detection. Its attack vector includes spear-phishing emails with malicious Microsoft Office documents or compressed archives containing the loader. The C2 infrastructure relies on domain generation algorithms (DGA) and HTTP/HTTPS communication with encrypted payloads, often mimicking legitimate API calls. Persistence is achieved via scheduled tasks or registry run keys. Evasion techniques include process hollowing, API hooking, and anti-debugging checks (e.g., IsDebuggerPresent). It also uses stolen digital certificates to sign its binaries.

📜 History & Notable Incidents

First observed in mid-2021, DarkShell was deployed in campaigns targeting Myanmar’s military government and Pakistani telecommunications firms. In 2022, SecurityScorecard linked it to intrusions in Southeast Asian energy sectors. No specific CVEs are directly associated with DarkShell; instead, it exploits known vulnerabilities like CVE-2018-15982 (Flash) or CVE-2017-11882 (Microsoft Office Equation Editor). Law enforcement has not publicly taken action against its operators.

🔍 Detection Indicators

Known file hashes include SHA256 f4a7c2e1b8d3... (exact hash varies per variant). Behavioral signatures include creation of mutex names like GlobalDShellMutex and registry keys under HKCUSoftwareMicrosoftWindowsCurrentVersionRun containing random strings. Network IOCs feature URLs matching patterns such as /update.php?uid=[0-9]+ and User-Agent strings mimicking Mozilla/5.0 Windows NT 10.0.

☠️ Risk & Impact

DarkShell enables theft of credentials, documents, and screen captures, leading to data exfiltration quantified by Trend Micro as affecting hundreds of endpoints per campaign. Financial losses are not publicly itemized, but impacted sectors include government, telecommunications, and energy in Southeast Asia and the Middle East. The malware’s low detection rate amplifies its risk.

🛡️ Mitigation

Defenders should implement YARA rules targeting DLL sideloading patterns (Trend Micro advisory) and block DGA domains through threat intelligence feeds. Disable Microsoft Office macros, apply patches for CVE-2017-11882, and use EDR solutions with process hollowing detection (MITRE ATT&CK: T1055.012).

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the malware listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.