Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 1e6fe89f4c072a72…

MALICIOUS

RTF / .DOC

1.59 MB First seen: 2022-03-22
MD5: 8e46560badffb18cf519568399a9e192 SHA-1: 8e3cf86825c7deb10a6cec7bdd68b71bfe61237d SHA-256: 1e6fe89f4c072a72cb2d6cdabbf400c8a857360b8825e1d6807de0e4ee4b5a67
300 Risk Score

Malware Insights

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

The file is an RTF document that contains embedded OLE object data, specifically triggering heuristics related to the Equation Editor vulnerability (CVE-2017-11882). The presence of excessive hex data and composite moniker structures strongly suggests the embedding of a malicious payload designed to be activated upon opening. ClamAV also explicitly identifies this as Rtf.Exploit.CVE_2017_11882-6584355-1, confirming the exploit vector.

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 ~1659KB 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_off00001df9.bin
78cd245a3cce611bca3d1c4410874db80ac7bb3de88e65753d657985fa68675a		 rtf-objdata-decoded RTF \objdata at offset 0x1DF9 830024 bytes

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