Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 471042eb7fb8a0e0…

MALICIOUS

RTF / .DOC

35.5 KB First seen: 2023-05-27
MD5: 2c10b8a40b52efe17821e4db18b5f357 SHA-1: 8740abe094cdc483caf4897b3e00a4b5cd2c8c7b SHA-256: 471042eb7fb8a0e0bef901eaae7ace1f91df34c277dd7484aa2bd565023e60f7
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 User Execution T1204.002 User Execution: Malicious File

The RTF document contains an embedded OLE object with an Equation Editor ProgID, and an \objupdate directive that forces OLE activation. The document body includes a lure instructing the user to 'Enable editing' to view the content, which is a common technique for malware droppers to bypass security settings. The embedded OLE object likely exploits a known vulnerability, such as CVE-2017-11882, to execute a payload.

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_off00004849.bin
fd6de4197b97ca806f1010b568b99ced3be6ca844c2cb0275f0a42ad824791f3
rtf-objdata-decoded RTF \objdata at offset 0x4849 1681 bytes