Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 05fc74541a0db8ab…

MALICIOUS

RTF / .DOC

8.7 KB First seen: 2022-07-15
MD5: 2bed390b398c5e78b489c195ca812d26 SHA-1: d3aef6f30a342f4b81ff32f50fade8188d149900 SHA-256: 05fc74541a0db8abc65300f5f0ecede42ea2fefec4b5a15ed9bcdac08d46b28f
80 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.005 Visual Basic

The RTF document contains OLE object data and an instruction to enable editing, which is a common lure to bypass macro security settings. The presence of RTF_OBJUPDATE suggests that the embedded OLE object is intended to be activated, likely to download and execute a second-stage payload. The document body is truncated and unreadable, but the heuristics strongly indicate a malicious intent to execute code.

Heuristics 3

  • \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 2 \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_off00000973.bin
4f2434f1a68d6755ee48c9544152b888ce9ffe63359f1ba041beef704d789bdc
rtf-objdata-decoded RTF \objdata at offset 0x973 1981 bytes