Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b92a674e4ce693aa…

MALICIOUS

RTF / .DOC

57.5 KB First seen: 2022-02-23
MD5: 86130355a87805f658b124a4c532c791 SHA-1: e0130c027dcaefe99451ea0665c50f4d16483c04 SHA-256: b92a674e4ce693aa211d3fe01fa900cbac02940e8f739e99c44d0b0277079d3a
180 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059 Command and Scripting Interpreter T1566 Phishing

The file is an RTF document that contains embedded OLE object data and triggers an objupdate event, indicating an attempt to activate embedded content. Critical heuristics identify the use of Equation Editor and specifically flag the CVE-2017-11882 vulnerability. This strongly suggests the document is designed to exploit this known vulnerability to achieve code execution, likely for the purpose of downloading and running a secondary malicious payload.

Heuristics 4

  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \objupdate forces OLE activation high RTF_OBJUPDATE
    RTF contains \objupdate — forces automatic OLE object instantiation when the document is opened, bypassing user interaction. Almost exclusively seen in Equation Editor exploit documents.
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000c5d.bin
acb9c6ef09586e0f339417f144e43ebd552d20fb2c9942d8cf2914fc18586b68
rtf-objdata-decoded RTF \objdata at offset 0xC5D 17544 bytes