Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 9d2df6d71a053ece…

MALICIOUS

RTF / .DOC

1.83 MB First seen: 2022-04-26
MD5: 3dca808e799937991be0841efec2703e SHA-1: 88666a40b1833813ad4c5dca78c2082e85be1194 SHA-256: 9d2df6d71a053ece983f54e3e5de5c1b86dc26f476571012a79c93cc5863c6bb
240 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File Execution: Malicious File T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell

The RTF file contains multiple indicators of exploitation for CVE-2017-11882, including OLE object data and a specific ProgID associated with Equation Editor. The presence of a large, hex-encoded OLE object strongly suggests it is used to hide a malicious payload. The exploit likely facilitates the download and execution of a second-stage payload, although no specific URLs or scripts were extracted in this analysis.

Heuristics 6

  • 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 ~1912KB 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
  • 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_off0000160c.bin
f519fcaf56c9627dfcc27afe90df98e973c50dd280c49d27a2305f8fc42acafe		 rtf-objdata-decoded RTF \objdata at offset 0x160C 956243 bytes

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