Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 3099ae9011821ec0…

MALICIOUS

RTF / .DOC

42.1 KB Authoring application: Msftedit 5.41.15.1515
MD5: 200022a6bf69079527996d34d517ad15 SHA-1: 97523211ea777c36d0bc07fcecd0a1a915da1422 SHA-256: 3099ae9011821ec09790ba33b33a1a87a5ed01ec1ef46ddf5cd95d2f62208864
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1027 Obfuscated Files or Information

The RTF document contains an embedded OLE object which, upon extraction, reveals a PE executable. Heuristics indicate this is a Package object containing OLE object data and a PE header in hex. ClamAV detected this as 'Win.Trojan.Agent-230724'. The embedded executable is the primary payload, likely delivered via social engineering to prompt user execution.

Heuristics 5

  • PE header (with DOS stub) in hex data critical RTF_MZ_HEX
    Hex-encoded PE (MZ + DOS stub) found inside RTF — likely an embedded executable payload
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Package object class high RTF_OBJCLASS_PACKAGE
    OLE Package object — can wrap arbitrary files
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000cf.bin
98914bfc10ae93a33762e7b09ac9d1273333150b6a8a88fa77c3736e4a87d7bc
rtf-objdata-decoded RTF \objdata at offset 0xCF 20927 bytes
Detection
ClamAV: Win.Trojan.Agent-230724
Obfuscation or payload: unlikely
embedded_rtf_0000019c.exe
8715b237fdb60dd8e37776a3b0947ea0bd51c40cdb3a5dd26c65354656b55e58
embedded-pe RTF hex-encoded MZ at offset 0x19C 20834 bytes
Detection
ClamAV: Win.Trojan.Agent-230724
Obfuscation or payload: unlikely