Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e9c2bf97e1a4578a…

MALICIOUS

RTF / .DOC

36.7 KB First seen: 2023-04-04
MD5: b9ce349df702ffdcce1666ca20dac1d5 SHA-1: 303efbd5f5a04e7bf972ddef478191a000f83251 SHA-256: e9c2bf97e1a4578ac311b8a7ab8e0f27edbd317310e874a8d759d7c5ec92fc11
180 Risk Score

Malware Insights

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

The RTF document contains heuristics indicating the presence of an Equation Editor exploit, a common method for delivering malicious payloads. The document body includes a lure instructing the user to 'Enable editing', which would likely activate the embedded OLE object and trigger the exploit. No scripts were extracted, and the specific family could not be determined.

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_off00005453.bin
435ff8d05d7453c6acf4ff399f33bb57891b6be2cffe68c33398257b0c6c13ad
rtf-objdata-decoded RTF \objdata at offset 0x5453 1372 bytes