Malicious RTF — malware analysis report

Static analysis result for SHA-256 c08ab5eb008cb37c…

MALICIOUS

RTF

9.6 KB
MD5: 959d74032e97d73f8ca3614f3b94ffbd SHA-1: 038dfcef88f1c34d0e2de52a40181dfa08d40895 SHA-256: c08ab5eb008cb37c1b4b56c66bdf35d68c0552f54d82094be77763f3c111d676
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Phishing: Spearphishing Attachment T1059.001 Command and Scripting Interpreter: PowerShell T1204.002 Malicious File Execution: User Execution

The RTF file contains an embedded OLE object that exploits a vulnerability in the Equation Editor. The ".objupdate" directive forces the OLE object to activate, which is a common technique for exploiting Equation Editor vulnerabilities. This likely leads to the execution of a second-stage payload, although no specific details about the payload could be determined from the provided evidence.

Heuristics 3

  • 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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000612.bin
5e8d71bf4748174950bded1b631e478468e3fc423f0aec0142072646de092a5f		 rtf-objdata-decoded RTF \objdata at offset 0x612 2364 bytes

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