Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 893648600397e543…

MALICIOUS

RTF / .DOC

2.25 MB
MD5: 21a1a3e183100b8333970cfc70293788 SHA-1: 9ebed136309eb28c97852257847cb42fef385405 SHA-256: 893648600397e543881641bcaa1062af39a6fe02895f59ce39ed2ae29b4a991e
180 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object specifically identified as related to CVE-2017-11882, which is a known vulnerability in Microsoft Equation Editor. The presence of `RTF_EQUATION_EDITOR` and `CVE_2017_11882_ACTIVATION_RELATED` heuristics strongly indicates exploitation of this vulnerability for client execution. The ` tfobjupdate` directive further forces OLE activation, suggesting the intent is to trigger the exploit upon opening.

Heuristics 5

  • 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.
  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • \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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001202.bin
94dd72e0f3e1881346f21c46040dcffd9491bafb23dcceb601d7d7d924e22a3b		 rtf-objdata-decoded RTF \objdata at offset 0x1202 32172 bytes
objdata_01_off00021059.bin
05fc6d2b0a81484fefcb6cc6d4891013e53501190027c21cdd96bf0ea0957523		 rtf-objdata-decoded RTF \objdata at offset 0x21059 478713 bytes

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