Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0a0a9ac2b7399c96…

MALICIOUS

RTF / .DOC

1.85 MB First seen: 2022-03-21
MD5: 3714e514ef3ceeca0226cd36cc7854c7 SHA-1: 354c71e667f4b05786bcb396533a1e7297e198c8 SHA-256: 0a0a9ac2b7399c96c3951044f93e964f3c01512128ea256141a10c66e4469d48
300 Risk Score

Malware Insights

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

The sample is an RTF document containing embedded OLE objects, specifically triggering heuristics related to Equation Editor exploits and OLE activation. ClamAV identifies this as Rtf.Exploit.CVE_2017_11882-6584355-1, indicating a known exploit for CVE-2017-11882. The large amount of hex-encoded data within the OLE object likely hides the second-stage payload. The primary attack vector is likely spearphishing attachment, leading to client-side exploitation.

Heuristics 7

  • Composite Moniker in RTF OLE object high CVE related RTF_COMPOSITE_MONIKER_RELATED
    RTF contains Composite Moniker CLSID in OLE object context, but no nearby scriptlet/SCT payload was confirmed. Treat as related moniker attack-surface evidence rather than proof of CVE-2017-8570 exploitation.
  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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 ~1930KB 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_off00001f3e.bin
3bfa75a3fcc10973ddfa19aeba78df5d37b407103fd9f24241a9ea4443db98e2		 rtf-objdata-decoded RTF \objdata at offset 0x1F3E 965176 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.