Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 904119b397ee2016…

MALICIOUS

RTF / .DOC

10.6 KB
MD5: c00542fe70e6856f86d6a0571891d0d2 SHA-1: 210cb73721c3f9f86b1f6879d1cbfbf0af417abc SHA-256: 904119b397ee2016603a024c191269e48978f47f951a4ec5c0da9f8ffb630dae
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an RTF document that contains embedded OLE object data. Heuristics indicate the exploitation of CVE-2017-11882 via Microsoft Equation Editor, which is a known vulnerability allowing for arbitrary code execution. The presence of ".objupdate" and the specific ProgID "eQuaTiOn.3" strongly suggest this exploit is being leveraged. No document body text or scripts were extracted, but the exploit itself is sufficient to classify the attack pattern.

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_off000015e2.bin
e6de5b8a3d20e8a47ec3d5799a32854f082fb0ad25c130dbab0d3514711cdfe6		 rtf-objdata-decoded RTF \objdata at offset 0x15E2 1626 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.