Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0a4ad68bbf810d76…

MALICIOUS

RTF / .DOC

9.8 KB
MD5: 02bc3b093c4d969f1c5e4ac929c4698d SHA-1: 48165f4fe32f4813de861c385b6118bd6053ac58 SHA-256: 0a4ad68bbf810d760ba140ecc845b008492cb65cc37be91c139edd344451647e
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The sample is an RTF document that contains embedded OLE objects, specifically triggering heuristics related to Equation Editor and CVE-2017-11882. This indicates an attempt to exploit a known vulnerability for client-side execution. The presence of `EquAtIoN.3` as a decoded object class strongly suggests the use of this exploit. The attack pattern is consistent with a malicious document delivered via spearphishing, designed to execute a payload.

Heuristics 5

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001250.bin
17c032670de8749c7162bab1c0aacb6cfa4618bca2f438ce68472f584096b2d3		 rtf-objdata-decoded RTF \objdata at offset 0x1250 1703 bytes

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