Xls.Dropper.Agent-7657208-0 — RTF malware analysis

Static analysis result for SHA-256 19ec071e413a88d0…

MALICIOUS

RTF

807.1 KB Created: 2019-01-07 23:54:00 First seen: 2020-07-24
MD5: 2a248f2c9f8e415832a18d28e4f5fd5d SHA-1: d2d5af40c2fbd01c2f8fe2c367a391eeb5abd4d5 SHA-256: 19ec071e413a88d0de44d0837486ecb6adfdbfeb85edd64db560af556effe7ee
182 Risk Score

Malware Insights

Xls.Dropper.Agent-7657208-0 · confidence 95%

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

The RTF file contains multiple OLE objects and uses the \objupdate directive to trigger their activation, a common technique for executing embedded malware. ClamAV identifies this as Xls.Dropper.Agent-7657208-0, suggesting it's a dropper designed to download and execute a secondary payload. The presence of embedded OLE objects strongly implies an exploitation attempt.

Heuristics 6

  • ClamAV: Xls.Dropper.Agent-7657208-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.Agent-7657208-0
  • \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
  • OLE object data medium RTF_OBJDATA
    RTF contains 10 \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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000a67.bin rtf-objdata-decoded RTF \objdata at offset 0xA67 36923 bytes
SHA-256: 5a8d9c658f93b27762866432180fcbc11868ecc321cb4d1e028e9d4a6ebc34aa