Malicious RTF — malware analysis report

Static analysis result for SHA-256 5aebac92125547ec…

MALICIOUS

RTF

70.3 KB First seen: 2023-08-10
MD5: 40ae68a1fbe6b4f12cc3c6e48d82fff1 SHA-1: 76d380fb965afaccfbb46791757b76b83f90367c SHA-256: 5aebac92125547ec3d79dac08bf20e1a990758cf2bace37672dca5adfe509aab
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document containing an OLE object, specifically leveraging the Equation Editor vulnerability (RTF_EQUATION_EDITOR). The document body contains text designed to trick the user into enabling editing, a common lure for malware delivery. The presence of an OLE object and the Equation Editor exploit strongly suggest an attempt to execute a malicious payload.

Heuristics 5

  • Split hex Equation Editor ProgID + OLE object critical RTF_EQUATION_EDITOR
    RTF embeds the Equation.3 ProgID as hex bytes near OLE object activation and splits the byte stream with whitespace or an ignorable RTF group. This is an Equation Editor OLE activation surface commonly used by CVE-2017-11882 / CVE-2018-0802 exploit documents.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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.
  • OLE object data medium RTF_OBJDATA
    RTF contains 1 \objdata section(s) — embedded OLE objects
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000026ca.bin
344b9c408a665474ec7b96058bfbf5d1a719fe9e5360f00de94e88541b9fe717
rtf-objdata-decoded RTF \objdata at offset 0x26CA 1740 bytes