Malicious RTF — malware analysis report

Static analysis result for SHA-256 41f1444194bf166f…

MALICIOUS

RTF

379.9 KB
MD5: b0db352ad95248e96a5baa14b26e8551 SHA-1: 9b88f427571341d403583bc0985085506ead33b7 SHA-256: 41f1444194bf166f00c0b7d1736a2f3a4726b8ec9e1d7ce846d78e17594a5b59
129 Risk Score

Malware Insights

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

The file is an RTF document containing OLE object data, specifically triggering heuristics related to Equation Editor vulnerabilities (RTF_EQUATION_EDITOR) and OLE activation ( objupdate). This strongly suggests an exploit targeting Equation Editor to achieve arbitrary code execution. The embedded OLE object data (objdata_00_off0000121f.bin) is the likely artifact containing the exploit or payload. The attack pattern is consistent with delivering a malicious payload via a document exploit.

Heuristics 4

  • Equation Editor CLSID critical RTF_EQUATION_EDITOR
    Equation Editor OLE CLSID found inside an OLE object — exploited by CVE-2017-11882 / CVE-2018-0802 / CVE-2018-0798
  • \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
  • Suspicious extracted artifact info EXTRACTED_FILE_STATIC_TRIAGE
    One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000121f.bin
ac228f14ac660a23be5b60989e59a22ad77c3591ddea958aacb20d77f92cfb2a
rtf-objdata-decoded RTF \objdata at offset 0x121F 64063 bytes
Detection
ClamAV: No threats found
Obfuscation or payload: likely
Carved artifact entropy is 7.93, consistent with packed or encrypted content.