Severity
Medium
Analysis Summary
Guloader is currently being distributed via spam email campaigns with archived attachments that contain the malware. The majority of malware downloaded by GuLoader is commodity malware, with AgentTesla, FormBook, and NanoCore being the most predominant. This downloader typically stores its encrypted payloads on Google Drive. It has also downloaded its payloads from Microsoft OneDrive and also from compromised or attacker-controlled websites. By utilizing legitimate file-sharing websites, GuLoader can evade network-based detection, as these services are not generally filtered or inspected in corporate environments. Usually, the downloaded payloads are encrypted with a hard-coded XOR key embedded in the malware, making it difficult for file-sharing service providers to identify the payload as malicious. This time, the GuLoader Shellcode injector is being distributed via a file named “EXTERNAL RFPPAN India Epoxy/PU 2021”. The scope of this campaign so far seems to be global.
Impact
- Malware installation
- detection evation
- Information theft
Indicators of Compromise
MD5
- 06f4851cbdc105cc140818b42f000b0e
- d17d180329065df1bf54501a2c8e138b
- 6c6a52c18f0ca26d357f2b4430f31568
- 1492683d46a38dc3af26589b486d55ab
- 2beb53482de8f6a713deb6fa9f9e7267
- a9e78788087acba99fa8241b7fddec0d
SHA-256
- 3844f8a2b3657d0141d505373f74beb01b6c2150c6931670bc241d600dca89eb
- 6a3b4d2025462d750011db9881bd74700cf7e2e7708398a18dfec422555ba438
- cbd91a64900eacff9502b5509769b33adb8472efadd2861d99fd95a06c5630be
- 8e55ce0d37045fc2d93dde800ae6fea90c6c71d29c5b28837a61d749d5a7810f
- 7ac7845621113c87e927eb2b582af6f1809e4866e4ee0f089dd1c6ab0042dd27
- 61776fac4b2ee10a9b1e93579daa3992c66c65d819a0275b84d0c2fd8d67d5c5
SHA-1
- 40ac7c31fd3e2f3524bd82200491741f02f9a1ef
- 255c70621a90d6070d2585ef47eaff05c143c54a
- 9b32a592e54100a67d907e2ad039b164961dc042
- d7dd2f48e26ca1683643f5671d5a5b7a26da73e0
- 0959ea9b1697d980da699f8375f91ca1df8e0f56
- 3bce4a9b51fc3fc3f9a023bdfac010f59393e302
Remediation
- Block the threat indicators at their respective controls.
- Search for IOCs in your environment.