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Threat Group 3390 APT Sample - HttpBrowser RAT Sample update.hancominc.com

yara CRITICAL Yara-Rules
aptbackdoorcommunity
This rule was pulled from an open-source repository and enriched with AI. Validate in a test environment before deploying to production.
View original rule at Yara-Rules →
Retrieved: 2026-06-04T23:00:00Z · Confidence: medium

Hunt Hypothesis

Threat Group 3390 is using a custom HttpBrowser RAT hosted on update.hancominc.com to maintain persistence and exfiltrate data. SOC teams should proactively hunt for this behavior in Azure Sentinel to detect and mitigate APT activity leveraging compromised domains for C2 operations.

YARA Rule

rule HttpBrowser_RAT_Sample1 
{

    meta:
        description = "Threat Group 3390 APT Sample - HttpBrowser RAT Sample update.hancominc.com"
        author = "Florian Roth"
        reference = "http://snip.ly/giNB"
        date = "2015-08-06"
        score = 80
        hash1 = "be334d1f8fa65a723af65200a166c2bbdb06690c8b30fafe772600e4662fc68b"
        hash2 = "1052ad7f4d49542e4da07fa8ea59c15c40bc09a4d726fad023daafdf05866ebb"
   
    strings:
        $s0 = "update.hancominc.com" fullword wide 
   
    condition:
        uint16(0) == 0x5a4d and filesize < 100KB and $s0
}

Deployment Notes

This YARA rule can be deployed in the following contexts:

This rule contains 1 string patterns in its detection logic.

References

False Positive Guidance

Original source: https://github.com/Yara-Rules/rules/blob/main/malware/APT_ThreatGroup3390.yar