Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 2c2c3e82979e4d27…

MALICIOUS

RTF / .DOC

10.4 KB First seen: 2022-09-30
MD5: 0f07d06c4ae38bfcf1aeca8bd5239f2c SHA-1: 42f3c0d3672ed59de1e50bb4c95aa79669a934df SHA-256: 2c2c3e82979e4d27dde2833f9df6c4e204f6bfed7db5c5e7f55f430e58ea68d0
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File T1059.005 PowerShell

The file is an RTF document containing an embedded OLE object that exploits CVE-2017-11882 via the Equation Editor. The presence of the SE_ENABLE_LURE heuristic indicates the document likely prompts the user to enable editing or macros, a common technique for malware delivery. The exploitation of CVE-2017-11882 suggests the document's primary purpose is to achieve code execution on the victim's machine, likely to download and run a further stage.

Heuristics 6

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • 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.
  • \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
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object
  • 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_off0000165d.bin
680819cee8c2deb11d05cf3f4d1b555fce1fc8778818ea7169a40e4108f79141		 rtf-objdata-decoded RTF \objdata at offset 0x165D 1635 bytes

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