Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ab980575f1abd51f…

MALICIOUS

RTF / .DOC

1.82 MB
MD5: f82abfee362eb0ae62564d1d823dd255 SHA-1: 916a64f434ae64dce46b34fb6dd2681071fb1519 SHA-256: ab980575f1abd51f4401c6785345649318444b681eb56880028046936cecc3da
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.001 PowerShell

The file is an RTF document containing an embedded OLE object that exploits the Equation Editor vulnerability (CVE-2017-11882). The heuristics indicate the presence of a decoded OLE1 object with a high entropy, suggesting it hides a payload. The ".objupdate" directive forces OLE activation, confirming the exploit attempt. The document body is heavily obfuscated and unreadable, providing no further context on the lure.

Heuristics 5

  • Equation Editor OLE1 native payload — CVE-2017-11882 related critical CVE related CVE_2017_11882_RELATED
    RTF decodes to an OLE1 Equation.3 embedded object whose native data is large and payload-like, and \objupdate requests automatic activation. This is the delivery shape used by Equation Editor RCE documents such as CVE-2017-11882/CVE-2018-0802, but the malformed MTEF record needed for exact 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.
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1899KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000010fe.bin
76e06403a02607226c47323dcc122ee35208abe0fd6075ae26a36eb70ff8b9a9		 rtf-objdata-decoded RTF \objdata at offset 0x10FE 949645 bytes

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