Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 0990d2b4483f6dcd…

MALICIOUS

RTF / .DOC

9.3 KB
MD5: 120ee104b4c621c91d354b9a6c9d10db SHA-1: 189b52962e78dfe2400d25eb6c935d63b5fa6b7a SHA-256: 0990d2b4483f6dcde15d8ed8f357cafcbb92f81d9e30fbc48a814ba7cf04aa14
180 Risk Score

Malware Insights

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

The RTF document contains an embedded OLE object that leverages the Equation Editor, specifically triggering CVE-2017-11882. This exploit allows for the execution of arbitrary code, indicating a malicious intent to compromise the user's system. The presence of the 'eqUatiON.3' ProgID is a strong indicator of this specific exploit.

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_off0000128d.bin
0dae64bde5f2412e7e5dd3fc3e38469d2a48b1590de71e17246d99a07dac62a5		 rtf-objdata-decoded RTF \objdata at offset 0x128D 1486 bytes

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