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| Src | Date (GMT) | Titre | Description | Tags | Stories | Notes |
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2022-08-02 15:17:00 | Anomali Cyber Watch: Velvet Chollima Steals Emails from Browsers, Austrian Mercenary Leverages Zero-Days, China-Sponsored Group Uses CosmicStrand UEFI Firmware Rootkit, and More (lien direct) | The various threat intelligence stories in this iteration of the Anomali Cyber Watch discuss the following topics: APT, Cyber mercenaries, Phishing, Rootkits, Spyware, and Vulnerabilities. The IOCs related to these stories are attached to Anomali Cyber Watch and can be used to check your logs for potential malicious activity.
Figure 1 - IOC Summary Charts. These charts summarize the IOCs attached to this magazine and provide a glimpse of the threats discussed.
Trending Cyber News and Threat Intelligence
SharpTongue Deploys Clever Mail-Stealing Browser Extension “SHARPEXT”
(published: July 28, 2022)
Volexity researchers discovered SharpExt, a new malicious browser app used by the North-Korea sponsored Velvet Chollima (Kimsuky, SharpTongue, Thallium) group. SharpExt inspects and exfiltrates data from a victim's webmail (AOL or Gmail) account as they browse it. Velvet Chollima continues to add new features to the app, the latest known version (3.0) supports three browsers: Microsoft Edge, Google Chrome, and Whale, the latter almost exclusively used in South Korea. Following the initial compromise, Velvet Chollima deploy SharpExt and to avoid warning the victim they manually exfiltrate settings files to change the settings and generate a valid "super_mac" security check value. They also hide the newly opened DevTools window and any other warning windows such as a warning regarding extensions running in developer mode.
Analyst Comment: Velvet Chollima is known for its tactic of deploying malicious browser extensions, but in the past it was concentrating on stealing credentials instead of emails. The group continues aggressive cyberespionage campaigns exfiltrating military and industrial technologies from Europe, South Korea, and the US. Network defenders should monitor for suspicious instances of PowerShell execution, as well as for traffic to and from known Velvet Chollima infrastructure (available in Anomali Match).
MITRE ATT&CK: [MITRE ATT&CK] Browser Extensions - T1176 | [MITRE ATT&CK] Email Collection - T1114 | [MITRE ATT&CK] Command and Scripting Interpreter - T1059 | [MITRE ATT&CK] Hide Artifacts - T1564
Tags: SharpExt, Velvet Chollima, Kimsuky, SharpTongue, Thallium, APT, North Korea, source-country:KP, South Korea, target-country:KR, USA, target-country:US, target-region:Europe, AOL, Gmail, Edge, Chrome, Whale, PowerShell, VBS, Browser extension
Untangling KNOTWEED: European Private-Sector Offensive Actor Using 0-Day Exploits
(published: July 27, 2022)
Microsoft researchers detail activity of DSIRF, Austrian private-sector offensive actor (PSOA). In 2021, this actor, tracked as Knotweed, used four Windows and Adobe 0-day exploits. In 2022, DSIRF was exploiting another Adobe Reader vulnerability, CVE-2022-22047, which was patched in July 2022. DSIRF attacks rely on their malware toolset called Subzero. The initial downloader shellcode is executed from either the exploit chains or malicious Excel documents. It downloads a JPG image file with extra encrypted data, extracts, decrypts and loads to the memory the Corelump memory-only infostealer. For persistence, Corelump creates trojanized copies of legitimate Windows DLLs that se |
Malware Tool Vulnerability Threat Patching Guideline Cloud | APT 37 APT 28 | |
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2021-08-24 17:11:00 | Anomali Cyber Watch: ProxyShell Being Exploited to Install Webshells and Ransomware, Neurevt Trojan Targeting Mexican Users, Secret Terrorist Watchlist Exposed, and More (lien direct) | The various threat intelligence stories in this iteration of the Anomali Cyber Watch discuss the following topics: APT37 (InkySquid), BlueLight, Ransomware, T-Mobile Data Breach, Critical Vulnerabilities, IoT, Kalay, Neurevt, and ProxyShell. The IOCs related to these stories are attached to Anomali Cyber Watch and can be used to check your logs for potential malicious activity.
Figure 1 - IOC Summary Charts. These charts summarize the IOCs attached to this magazine and provide a glimpse of the threats discussed. Current Anomali ThreatStream users can query these indicators under the “anomali cyber watch” tag.
Trending Cyber News and Threat Intelligence
Microsoft Exchange Servers Still Vulnerable to ProxyShell Exploit
(published: August 23, 2021)
Despite patches a collection of vulnerabilities (ProxyShell) discovered in Microsoft Exchange being available in the July 2021 update, researchers discovered nearly 2,000 of these vulnerabilities have recently been compromised to host webshells. These webshells allow for attackers to retain backdoor access to compromised servers for further exploitation and lateral movement into the affected organizations. Researchers believe that these attacks may be related to the recent LockFile ransomware attacks.
Analyst Comment: Organizations running Microsoft Exchange are strongly encouraged to prioritize updates to prevent ongoing exploitation of these vulnerabilities. In addition, a thorough investigation to discover and remove planted webshells should be undertaken as the patches will not remove planted webshells in their environments. A threat intelligence platform (TIP) such as Anomali Threatstream can be a valuable tool to assist organizations ingesting current indicators of compromise (IOCs) and determine whether their Exchange instances have been compromised.
MITRE ATT&CK: [MITRE ATT&CK] Exploitation for Client Execution - T1203 | [MITRE ATT&CK] Web Shell - T1100 | [MITRE ATT&CK] Hidden Files and Directories - T1158 | [MITRE ATT&CK] Source - T1153
Tags: CVE-2021-34473, CVE-2021-34523, CVE-2021-31207, Exchange, ProxyShell, backdoor
LockFile: Ransomware Uses PetitPotam Exploit to Compromise Windows Domain Controllers
(published: August 20, 2021)
A new ransomware family, named Lockfile by Symantec researchers, has been observed on the network of a US financial organization. The first known instance of this ransomware was July 20, 2021, and activity is ongoing. This ransomware has been seen largely targeting organizations in a wide range of industries across the US and Asia. The initial access vector remains unknown at this time, but the ransomware leverages the incompletely patched PetitPotam vulnerability (CVE-2021-36942) in Microsoft's Exchange Server to pivot to Domain Controllers (DCs) which are then leveraged to deploy ransomware tools to devices that connect to the DC. The attackers appear to remain resident on the network for several |
Ransomware Malware Tool Vulnerability Threat Patching Cloud | APT 37 |
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