Malicious RTF — malware analysis report

Static analysis result for SHA-256 e16a3519f80d61cb…

MALICIOUS

RTF

1.29 MB Created: 2019-01-07 23:54:00 First seen: 2019-12-09
MD5: df8054f233e523ed271d63f6f6095f7e SHA-1: e2448f7ffaa77dfae455add95b83d244a5ee0b37 SHA-256: e16a3519f80d61cb459aa8e65e7eca280b732d7c9f16eff9931255528f869903
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 ~1049KB of hex-encoded data inside \objdata sections — may hide a payload
  • 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 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_off0000246e.bin rtf-objdata-decoded RTF \objdata at offset 0x246E 130606 bytes
SHA-256: f2b37ca12bff38f7d70153f64d99a13c637d4d7da1a35cfb4e6f9e7d287f361c
objdata_05_off001433e9.bin rtf-objdata-decoded RTF \objdata at offset 0x1433E9 1271 bytes
SHA-256: be306341e1481ee02d5ad0fc72cde5c3575623c29b0958bc66c51e5592bb193f

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