Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 e758afd531146c31…

MALICIOUS

RTF / .DOC

16.2 KB First seen: 2022-09-28
MD5: 82cc17da621b6832c9789e31bc9516a4 SHA-1: f90c8bee6c84068ed7e250e90dd824cca6915a4e SHA-256: e758afd531146c31a0287516c4159c31afcd4fccbb9687b675540496584ff0ee
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The file is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor vulnerability. The presence of \objupdate and a lure to 'Enable editing' strongly suggests an attempt to exploit this vulnerability to execute a malicious payload. No scripts were extracted, and the document body was truncated, limiting further analysis of the specific lure.

Heuristics 4

  • 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
  • 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_off00001edb.bin
9e63175b08d135418b421362b48fd7b6770964297df5cb8d9e6b29e5aca60ee2
rtf-objdata-decoded RTF \objdata at offset 0x1EDB 1732 bytes