22-November-2022
Welcome to the weekly threat detection update report from Stamus Networks. Each week, you will receive this email with a summary of the updates.
Current Stamus Threat Intelligence (STI) release version: 601
This week, in addition to daily ruleset and IOC updates, we provided Stamus Security Platform customers with the following improved defense(s):
Note: a "method" as referenced below, is a discrete detection vector for a given threat.
The following detections were added to your Stamus Security Platform this past week:
Cisco Talos compared this RAT to Cobalt Strike and Sliver. Written in Rust. Malpedia
Manjusaka - corelight | Manjusaka - malpedia |
The following detections were updated this past week with changes to kill chain phase(s) or MITRE ATT&CK tactic(s)/technique(s):
Cobalt Strike is a commercial, full-featured, penetration testing tool which bills itself as “adversary simulation software designed to execute targeted attacks and emulate the post-exploitation actions of advanced threat actors”. Cobalt Strike’s interactive post-exploit capabilities cover the full range of ATT&CK tactics, all executed within a single, integrated system.
In addition to its own capabilities, Cobalt Strike leverages the capabilities of other well-known tools such as Metasploit and Mimikatz. MITRE
Kimsuky is a North Korean-based threat group that has been active since at least September 2013. The group initially focused on targeting Korean think tanks and DPRK/nuclear-related targets, expanding recently to the United States, Russia, and Europe. The group was attributed as the actor behind the Korea Hydro & Nuclear Power Co. compromise. MITRE
An adversary may rely upon a user opening a malicious file in order to gain execution. Users may be subjected to social engineering to get them to open a file that will lead to code execution. This user action will typically be observed as follow-on behavior from Spearphishing Attachment. Adversaries may use several types of files that require a user to execute them, including .doc, .pdf, .xls, .rtf, .scr, .exe, .lnk, .pif, and .cpl.
Adversaries may employ various forms of Masquerading on the file to increase the likelihood that a user will open it.
While Malicious File frequently occurs shortly after Initial Access it may occur at other phases of an intrusion, such as when an adversary places a file in a shared directory or on a user's desktop hoping that a user will click on it. This activity may also be seen shortly after Internal Spearphishing. MITRE
Remcos is a closed-source tool that is marketed as a remote control and surveillance software by a company called Breaking Security.
Remcos has been observed being used in malware campaigns.
It leverages compromised websites and performs some of the most creative fingerprinting checks we’ve seen, before delivering its payload (NetSupport RAT). Malwarebytes
For initial access to a targeted corporate network, the LockBit gang recruits affiliates and helpers as mentioned, who perform the actual intrusion on targets, usually via valid remote desktop protocol (RDP) account credentials. To help the cause, LockBit’s creators provide their partners with a handy StealBit trojan variant, which is a tool for establishing access and automatically exfiltrating data. Threatpost
DPRK APT actor tracked by Proofpoint as TA444 Malpedia
Again, the generic nature of this detection means that the Payloads performed by this group of trojans may be highly variable, and therefore difficult to describe specifically. This group of trojans has been observed to perform any, or all, of the following actions:
redirect Web traffic
- manipulate certain Windows or third-party applications including settings or configurations
- drop or install additional malicious programs
- download and run additional malicious programs
Please note that this list is not exhaustive.
Microsoft
The following threat detection(s) were improved this past week with new or updated threat methods.
| Name of threat | New coverage | Total coverage | Last updated | ||||
|---|---|---|---|---|---|---|---|
| New Detection methods | Kill chain phases | Protocols involved | Detection methods | Kill chain phases | Protocols involved | ||
| Cobalt Strike | 2 | command and control | tls, http | 386 | actions on objectives, command and control, delivery, exploitation | dns, http, smb, tcp, tls, udp | 2022-11-18 |
| Kimsuky | 2 | command and control | dns | 100 | actions on objectives, command and control, delivery | dns, ftp, ftp-data, http, tls | 2022-11-18 |
| MalDoc | 5 | delivery | dns, http | 480 | actions on objectives, command and control, delivery | dns, http, tcp, tls | 2022-11-19 |
| Manjusaka | 3 | command and control | http | 3 | command and control | http | 2022-11-15 |
| Remcos | 2 | command and control | tcp | 868 | command and control, delivery | dns, http, tcp, tcp-pkt | 2022-11-17 |
| SocGholish | 8 | command and control | dns | 191 | actions on objectives, command and control, delivery, exploitation, reconnaissance | dns, http, tcp, tls | 2022-11-17 |
| StealBit | 1 | command and control | tcp | 5 | actions on objectives, command and control | http, tcp | 2022-11-18 |
| TA444 | 4 | command and control | dns, tls | 102 | command and control | dns, http, tls | 2022-11-19 |
| Trojan Agent | 1 | command and control | http | 369 | actions on objectives, command and control, delivery, installation | dns, http, ip, smtp, tcp, tcp-pkt, tcp-stream, udp | 2022-11-17 |
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Stamus Networks believes in a world where defenders are heroes, and a future where those they protect remain safe. As organizations face threats from well-funded adversaries, we relentlessly pursue solutions that make the defender’s job easier and more impactful. The global leader in Suricata-based network security solutions, Stamus Networks helps enterprise security teams know more, respond sooner and mitigate their risk with insights gathered from cloud and on-premise network activity. Our Stamus Security Platform combines the best of intrusion detection (IDS), network security monitoring (NSM), and network detection and response (NDR) systems into a single solution that exposes serious and imminent threats to critical assets and empowers rapid response.
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