Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0eaf2f83fcd16fc9…

MALICIOUS

RTF / .DOC

154.3 KB First seen: 2022-05-16
MD5: f0154b8aab7bab6b91a5c787d66fe0b9 SHA-1: b9ab74c5b71a9bccb3c241980e41d5f97e0036c2 SHA-256: 0eaf2f83fcd16fc9c7de348835a3671327191617e8b9b8a2998c3ea8ff866cee
240 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The file is an RTF document that contains embedded OLE objects, specifically triggering a critical heuristic for the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to be exploited for client-side code execution. The presence of ".vbs" in the decoded object data suggests the exploit likely leads to the execution of a Visual Basic script, potentially for downloading further malicious content.

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.
  • 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
  • ClamAV: Rtf.Exploit.CVE_2017_11882-6398227-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6398227-0
  • \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 2 \objdata section(s) — embedded OLE objects
  • Embedded OLE object medium RTF_OBJEMB
    RTF contains \objemb — embedded OLE object

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off0000129e.bin
6a0ab8c606ecf8ec2214a4917b16c3e1b33e2143d9d0f4cc633ace6e7a4f9a27		 rtf-objdata-decoded RTF \objdata at offset 0x129E 68521 bytes
objdata_01_off00023d4e.bin
655efb6940d2262d1f14fd333d03898e9dc675a83bd4fc5905c200e987724116		 rtf-objdata-decoded RTF \objdata at offset 0x23D4E 3800 bytes

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