Malicious RTF — malware analysis report

Static analysis result for SHA-256 452d9e393d023dde…

MALICIOUS

RTF

852.3 KB Created: 2019-01-07 23:54:00 First seen: 2019-12-10
MD5: 6575764e1a8413dacf53407bfe20d9bd SHA-1: a2e599293a0f1ee267fbe5d69ae1578b46041b26 SHA-256: 452d9e393d023dde770f5b114a1bcc399b0a08c3f7871bd5291da28e3b11bb88
122 Risk Score

Malware Insights

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

The RTF file contains multiple OLE object embeddings, with specific rules indicating the presence of package objects and an \objupdate command designed to force OLE activation. This suggests the file is designed to exploit vulnerabilities within OLE object handling to execute arbitrary code. The embedded object file 'objdata_00_off00000b2c.bin' is the primary artifact of interest.

Heuristics 5

  • \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 4 \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 137774 bytes
SHA-256: 876cfc5f2cb02b5bc7737f980746d7e5c75a5c8cbcbb2ed519f2c372dabaf75e
objdata_03_off000cd959.bin rtf-objdata-decoded RTF \objdata at offset 0xCD959 1271 bytes
SHA-256: be306341e1481ee02d5ad0fc72cde5c3575623c29b0958bc66c51e5592bb193f