Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 48a35d8cff0fe7e8…

MALICIOUS

RTF / .DOC

11.0 KB First seen: 2022-03-22
MD5: c1f39c0b60ddf78da94b5ee7231dfe58 SHA-1: f415bcfe0db7e8f82cd7a12beb8e45e55c127126 SHA-256: 48a35d8cff0fe7e815f69169ab8014767ecc307ac03f55110c47c7ed0185fe56
120 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The RTF document contains OLE object data and triggers ".objupdate" which forces OLE activation. Crucially, it contains an Equation Editor CLSID, indicating exploitation of CVE-2017-11882. This vulnerability allows for arbitrary code execution, which is likely used to download and execute a secondary payload, as suggested by the embedded OLE object data.

Heuristics 3

  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000fcf.bin
9c94a9fe1868f6ada9b171af225cd5e6b70a4f62f78d2d76ed78a93c089d4bbd		 rtf-objdata-decoded RTF \objdata at offset 0xFCF 3624 bytes

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