Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3cb7612a7e4a9f46…

MALICIOUS

RTF / .DOC

2.04 MB First seen: 2022-03-29
MD5: 72dd1033cac53169bf999ef52c230d99 SHA-1: 8b958e78be875f58939fabb54e35c9aa03ef4118 SHA-256: 3cb7612a7e4a9f460ffb2118bfd213075ec9f01bf49aad020aad9cfc00bcb6ac
300 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059 Command and Scripting Interpreter

The file is an RTF document that contains embedded OLE objects, specifically triggering heuristics related to Equation Editor vulnerabilities. The presence of `RTF_EQUATION_EDITOR` and `CLAMAV_DETECTION: Rtf.Exploit.CVE_2018_0802-6825822-0` strongly indicates exploitation of CVE-2018-0802. The large amount of hex-encoded data within `objdata` sections suggests a hidden payload. The `RTF_OBJUPDATE` heuristic indicates that the OLE object is set to activate automatically, facilitating the exploit execution.

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 ~2130KB 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_off000017ea.bin
56d5bb019c60890477d5060960d7f1f12b75f74081baa8e8be4ae1fe95d549fb		 rtf-objdata-decoded RTF \objdata at offset 0x17EA 1065540 bytes

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