Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0815cbfce180ff85…

MALICIOUS

RTF / .DOC

22.5 KB
MD5: 4477bbb3bb1aac721d9c2e5b5ba487dc SHA-1: ee01fa19c853b6b6bd00cf672c86292bd8fb701a SHA-256: 0815cbfce180ff852b9e45d19d9279ac40d4983cb406040d2234ae438070bc3f
180 Risk Score

Malware Insights

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

The RTF document contains embedded OLE objects, specifically triggering the CVE-2017-11882 vulnerability through an Equation Editor object. This exploit allows for arbitrary code execution, indicating a malicious intent to compromise the user's system. No specific malware family could be identified from the available evidence.

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_off00001f36.bin
8143248972fbb384cfa642aebd8926ec1a8a3fea7a53ab10990746073c75eda4		 rtf-objdata-decoded RTF \objdata at offset 0x1F36 2017 bytes

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