Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a076938fa168d283…

MALICIOUS

RTF / .DOC

18.5 KB First seen: 2022-08-29
MD5: 656d54109d987767dc8eb48bcad01912 SHA-1: 61b4b05f801400711619b5273c8c27f39e765fd7 SHA-256: a076938fa168d283115525aebeb972f8eba151566a82e06503c23e0d95c4dffa
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1566.002 Phishing: Spearphishing via Service

The file is an RTF document containing OLE object data, with heuristics indicating that \objupdate forces OLE activation. The document body contains a lure instructing the user to 'enable editing to view in readable format', a common technique to bypass macro security settings and deliver malicious content. No scripts were extracted, and the specific malware family could not be determined.

Heuristics 5

  • 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.
  • \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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000016bd.bin
446d5c9e466aef365ef3a80a39f72c3a39f3450fed3123017ba43fec4ea2d1b2
rtf-objdata-decoded RTF \objdata at offset 0x16BD 4266 bytes