Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 26f707f48fd2c054…

MALICIOUS

RTF / .DOC

9.1 KB
MD5: 62121e119f236545b4491b2a728a016a SHA-1: e3c52a50485097387aab3322f01f12a9e3afefd7 SHA-256: 26f707f48fd2c0541b70a8ca4106f695f5ab51917bf8a699dfbb11a6aa43c171
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability through the Equation Editor. This indicates the document is designed to exploit this known vulnerability for initial execution. The embedded object is obfuscated and activated via \objupdate, strongly suggesting a malicious intent to download and execute a secondary 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_off00001278.bin
e99b33f0a7839a2456da9eb395b72b605e7991f4d5007acf65106d3f8a081159		 rtf-objdata-decoded RTF \objdata at offset 0x1278 1467 bytes

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