Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 19465495f815fdc0…

MALICIOUS

RTF / .DOC

2.05 MB First seen: 2022-03-22
MD5: b7521be37e4aa2a94a7b8715b11e4fa4 SHA-1: 67e32539d69156de65e1a34b7bee130260196b65 SHA-256: 19465495f815fdc07b694ec1a0da48cab639a4786a8ee94ddbb743d84f1c20e0
340 Risk Score

Malware Insights

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

The RTF file contains multiple indicators of exploitation targeting Microsoft Equation Editor, specifically related to CVE-2018-0802. The presence of OLE object data, automatic linking, objupdate directives, and excessive hex data strongly suggests the embedding of a malicious payload designed to be executed upon opening. ClamAV detection confirms this, identifying it as Rtf.Exploit.CVE_2018_0802-6825822-0.

Heuristics 8

  • 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
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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 ~2150KB 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_off000000a3.bin
ff3f00eca3f5e83dd29476ee626b50d734d5e49a03ada421dbd3a9e283813353		 rtf-objdata-decoded RTF \objdata at offset 0xA3 1075277 bytes

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