Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 ac456d7ae2465d0c…

MALICIOUS

RTF / .DOC

1.86 MB First seen: 2022-03-28
MD5: 7860eec7d4f0eab200e40afbe16dc9c7 SHA-1: 50fb8a9b5f4d55e4a9bcc2114e47bae864868cdf SHA-256: ac456d7ae2465d0c48b1dfb2a76e89a4200f3768ba5982094b09276010d4b7cc
300 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file is an RTF document containing embedded OLE object data, specifically triggering critical heuristics for Equation Editor exploitation (CVE-2018-0802). The presence of large hex data blocks and composite monikers suggests a hidden payload. ClamAV identifies this as Rtf.Exploit.CVE_2018_0802-6825822-0, indicating a known exploit targeting the Equation Editor vulnerability. The primary attack vector is likely spearphishing, leading to the execution of a malicious payload.

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_2018_0802-6825822-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
  • \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 ~1939KB 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_off000017d9.bin
5f64c0bff8b15282285eb2a05443e622fde09387fb6f6d232c94b965e86f8dbf		 rtf-objdata-decoded RTF \objdata at offset 0x17D9 969791 bytes

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