Malicious RTF — malware analysis report

Static analysis result for SHA-256 83723ce80c47a83e…

MALICIOUS

RTF

1.04 MB Created: 2019-01-07 23:54:00 First seen: 2020-02-04
MD5: e8e44e0e63ae17555c5269edce4a5a94 SHA-1: 4b089068413ea86914afda9e4f23131eb1ff1f3d SHA-256: 83723ce80c47a83eb6758145b2047412cd86328225859bb188d9ff8ebf20a4ac
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1027 Obfuscated Files or Information

The RTF file contains multiple OLE objects, with ".objupdate" forcing activation and large hex-encoded data blocks likely hiding a payload. This suggests an exploit targeting OLE object vulnerabilities to execute arbitrary code. The presence of embedded OLE objects and the potential for payload delivery points towards a spearphishing attachment attack vector.

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
  • Large hex data blocks in OLE object high RTF_EXCESSIVE_HEX
    RTF contains ~1032KB of hex-encoded data inside \objdata sections — may hide a payload
  • OLE object data medium RTF_OBJDATA
    RTF contains 5 \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 http://schemas.microsoft.com/office/word/2003/wordml In RTF body

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000244f.bin rtf-objdata-decoded RTF \objdata at offset 0x244F 128558 bytes
SHA-256: 70e8b9cd2f21c3242226fda11abe04e78d47708c608f78a819bbb6561f33d468
objdata_04_off000ff1e7.bin rtf-objdata-decoded RTF \objdata at offset 0xFF1E7 6502 bytes
SHA-256: 4d78aaeea748a71dcb0130caf1f2c86d1f67ede8256319ad5cd481b642f10cad

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