Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 a0c80e5fbbb82cf3…

MALICIOUS

RTF / .DOC

11.5 KB
MD5: 9354444f44df86ef76301741b6798b37 SHA-1: 62645f9aa7a18fda8b55ae18d17bda7f598a6335 SHA-256: a0c80e5fbbb82cf3316057ff30737100492e945150cf075933aaeb31c60bf61a
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1068 Exploit for Privilege Escalation

The sample is an RTF document that triggers CVE-2017-11882 via an obfuscated Equation Editor ProgID and embedded OLE objects. The presence of RTF_OBJUPDATE and RTF_EQUATION_EDITOR heuristics indicates a forced activation of the vulnerability to achieve remote code execution. The document body consists of randomized characters, which is common in exploit delivery documents to bypass simple detection or avoid user suspicion.

Heuristics 5

  • Obfuscated Equation Editor ProgID + activation critical CVE related RTF_EQUATION_EDITOR
    RTF decodes to an Equation.3 ProgID from top-level \objdata hex after nested RTF junk groups are ignored, and the document also contains \objemb plus \objupdate activation. This is an obfuscated Equation Editor exploit surface associated with CVE-2017-11882 / CVE-2018-0802 families, but no exact malformed MTEF CVE primitive was recovered from this object.
  • 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.
  • \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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00001c50.bin
56dc967dbe22c8d63d4a67d843c24c6872cf0755a98e16a509ae8156d339690a		 rtf-objdata-decoded RTF \objdata at offset 0x1C50 1683 bytes

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