Rewterz Threat Alert – GuLoader Malspam Campaign – Active IOCs
September 24, 2021Rewterz Threat Alert – RedLine Malware – Active IOCs
September 24, 2021Rewterz Threat Alert – GuLoader Malspam Campaign – Active IOCs
September 24, 2021Rewterz Threat Alert – RedLine Malware – Active IOCs
September 24, 2021Severity
Medium
Analysis Summary
NjRat is a Remote Access Trojan, which is found leveraging Pastebin to deliver a second-stage payload after initial infection. There are multiple versions of the secondary payload used, ranging from base64 encoded version, hexadecimal, JSON data format, compressed blobs, and also plain text data with malicious URLs embedded within. This is done in order to evade detection by security products and increase the possibility of operating unnoticed. njRat is developed in .NET framework and is able to hijack the functions of a compromised machine remotely, including taking screenshots, exfiltrating data, keylogging, and killing processes such as antivirus programs, while also connecting the machine to a botnet. RAT was also found abusing Windows API functions such as Windows API calls such as GetKeyboardState(), GetAsynckeyState(), MapVirtualKey() for keylogging, and data theft. It was also discovered downloading web scraping tools such as “proxy scrapper” in order to extract large amounts of data via proxies.
Impact
- Unauthorized Remote Access
- Data Exfiltration
- Credential Theft
Indicators of Compromise
MD5
- dcff9b752094a4b333c397007cecfdf2
- 8b30cce3ed48c78dbdea76176e6cd948
- db4608c1b87e8288d28b8f24f69fc8cd
- 383b07d8b5831e2e3edea850be6078fc
- e4d4a57e8422b5659f3a7a09f73d4ad1
- d8af9cd45cd97d25fd91457304beb9c6
SHA-256
- 0aaa8913bbb9ddbff6aab093beb12a2d8dad2f7b488d99b923dac1756003b1ab
- 9cdddbc4ae10f4257788af1e3be90377e299741912e0f0cab60304c8a10a47b9
- 514fd30045da850cae1cdc246bc8fdf5e0af478e34a61f6104fa022af4c42779
- ae14714526a4ce76249878615239321e6b309fe2d0b394c1fe492d9c7a2d70d7
- 1153bedc6acb9a799f214b11ea5a89c783438978e1104e5b2f4d817ac3abe4d4
- c053e180d2dcbdf24c0cd5a1d555fe518128e48a408f6f4538c7dff049e073db
SHA-1
- eb59cb01b60752e09720ead14a15142f3f126cfc
- 970a47cefc154bc76b8eaae63eeb63a30fe6645a
- 1989e4d7bd6e1196ce2cc454dc24e150c651dc23
- d9f2a0d1fd55ca0e6a65e80b1f33cefc3782ba1d
- 876271ded081c82e51d2e913025dccbd348fd504
- 6eebceebb1d5ca8f427b3465e541f9388a778f11
Remediation
- Block all threat indicators at your respective controls.
- Search for IOCs in your environment.