Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 af508a4539b0b66b…

MALICIOUS

RTF / .DOC

68.8 KB First seen: 2023-09-04
MD5: f79d259a894c7b4ad6bb48d6038c4d17 SHA-1: fd8250b2343dfcc4f4b723daa57d7d16efd9471b SHA-256: af508a4539b0b66bf8a60c093899c344c1d96f7c9a8883288a9f189212eabcf1
80 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1566 Phishing T1566.001 Phishing: Spearphishing Attachment

The sample is an RTF document that contains OLE object data and an objupdate directive, indicating it's designed to activate embedded objects. The document body text attempts to deceive the user into enabling editing and macros by discussing financial audits, a common lure for malware delivery. The heuristic SE_ENABLE_LURE explicitly flags this social engineering tactic.

Heuristics 3

  • \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_off00003773.bin
b5ba3cabbf2917e6c548bbd5086d31179b43f5d26021f6ccb881655088db2c37
rtf-objdata-decoded RTF \objdata at offset 0x3773 4169 bytes