Malicious RTF — malware analysis report

Static analysis result for SHA-256 47d20d9791d41e96…

MALICIOUS

RTF

601.7 KB Created: 2019-01-07 23:54:00 First seen: 2021-02-18
MD5: bc6218589cada139ad755d98d4ea4d01 SHA-1: 496cdecd6985391d7a81aa09c66b3dfc9929a00f SHA-256: 47d20d9791d41e967db81210f4252b242b564842d451863c88d8162d37f9ded5
162 Risk Score

Malware Insights

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

The RTF file contains multiple embedded OLE objects, with specific heuristics indicating that \objupdate forces OLE activation and that a package object class is present. One of the extracted artifacts, objdata_00_off00002458.bin, was flagged as suspicious due to VBA auto-execution. This suggests the file is designed to exploit vulnerabilities or trick the user into executing embedded malicious content upon opening.

Heuristics 6

  • \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.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
  • OLE object data medium RTF_OBJDATA
    RTF contains 6 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://github.com/weareoutman/clockpicker/blob/master/LICENSE In RTF body
    • http://schemas.microsoft.com/office/word/2003/wordmlIn RTF body
    • http://weareoutman.github.io/clockpicker/In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00002458.bin rtf-objdata-decoded RTF \objdata at offset 0x2458 56366 bytes
SHA-256: 7d5b65cc69162404870a09b577366b33cc1d75a723177d13e171b981ecc0deaa
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved macro source contains an auto-exec entry point and execution/download terms.
objdata_05_off0008d341.bin rtf-objdata-decoded RTF \objdata at offset 0x8D341 4723 bytes
SHA-256: 639b121654077d4d5c038fce668c25799a7a20357600634475e88ce75ad8da35

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