Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 b5e8c3e20ab90a83…

MALICIOUS

RTF / .DOC

17.0 KB
MD5: f0166b16d4055bb3dd1bc7704b55b0d4 SHA-1: d8bb1a2a414e475241fa1cca9cb97c87f91ab724 SHA-256: b5e8c3e20ab90a830bded525ed6f56b4bbcb3cf36d31bf6dbda64b8a4a986fc6
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell

The RTF document contains embedded OLE object data, specifically related to Equation Editor. Heuristics indicate the exploitation of CVE-2017-11882 through the activation of an obfuscated Equation Editor object. This suggests the document is designed to deliver a payload via this known vulnerability.

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_off00001932.bin
92bcf769bc38e7ca566d9b203dac8588c55d2f01eb7ffc11cbbd2290af1b844a		 rtf-objdata-decoded RTF \objdata at offset 0x1932 1781 bytes

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