Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 edc958ef7bfe69e2…

MALICIOUS

RTF / .DOC

30.4 KB First seen: 2022-12-12
MD5: f402950a4794587a1cbd8dcb8c325f09 SHA-1: 64071d86d257ff2e3f5d1c739d0674eae1193cac SHA-256: edc958ef7bfe69e2754b08563ce4183c7582fc0380b1907fc6e2988c10c82a8f
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic T1203 Exploitation for Client Execution

The RTF document contains embedded OLE object data, specifically related to Microsoft Equation Editor, and triggers heuristics for CVE-2017-11882. The document body includes a lure instructing the user to 'Enable editing', which is a common technique to bypass macro security settings and facilitate exploitation. The presence of the Equation Editor ProgID 'equaTiON.3' suggests an attempt to exploit this known vulnerability.

Heuristics 6

  • Equation Editor activation — CVE-2017-11882 related high CVE related CVE_2017_11882_ACTIVATION_RELATED
    RTF decodes to an Equation.3 ProgID and requests OLE activation with \objemb plus \objupdate. This reaches the legacy Equation Editor attack surface used by CVE-2017-11882/CVE-2018-0802 documents, but the malformed MTEF/native payload needed for stronger attribution was not recovered.
  • 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.
  • Automatically linked OLE object high RTF_OBJAUTLINK
    RTF contains \objautlink — an automatically linked OLE object surface that can be updated or activated when Word opens the document.
  • \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_off0000500a.bin
9e0dc07860927e7a600fce629ac3b49e62ecd7e876f0fd2dc148d12e99d6d449		 rtf-objdata-decoded RTF \objdata at offset 0x500A 1636 bytes

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