RTF / .DOC malware analysis — malicious · c6b19b470acaf997

MALICIOUS

RTF / .DOC

28.2 KB First seen: 2022-12-20

MD5: 9509e3fac5a585c3107d4f98fb194b92 SHA-1: df4754ae6a52248c4499ef803ae85b1eeef146c1 SHA-256: c6b19b470acaf9970a99ceeb8cb1826654e67d8dd8baaf5c57c5cbded7538087

140 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1059 Command and Scripting Interpreter

The sample is an RTF document that contains an embedded OLE object, specifically targeting the Equation Editor vulnerability. The document body includes a lure instructing the user to 'Enable editing' to view its content, which is a common tactic for macro-based malware delivery. The presence of RTF_EQUATION_EDITOR and RTF_OBJUPDATE heuristics strongly suggests exploitation of CVE-2017-11882.

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.

Filename	Kind	Source	Size
`objdata_00_off000058eb.bin` `e014d8f6e84afa09f3265f156aa25aeac4c0c829d1f4633c2e7cf7824f08e184`	rtf-objdata-decoded	RTF \objdata at offset 0x58EB	1345 bytes

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