Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 13b7339525837325…

MALICIOUS

RTF / .DOC

10.3 KB
MD5: 65a3355965c3138d2917435842a07b41 SHA-1: ee16b9247f6bf3dec90d5346d0c3ece8678961cc SHA-256: 13b73395258373254b7601d9cb4e23bd161baf193c10d0cc087543dbd81f90f5
180 Risk Score

Malware Insights

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

The file is an RTF document containing an embedded OLE object that triggers the Equation Editor vulnerability (CVE-2017-11882). This vulnerability is known to be exploited for arbitrary code execution, typically to download and run a second-stage payload. The ClamAV signature confirms the specific exploit targeted.

Heuristics 4

  • 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_11882-6584355-1 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2017_11882-6584355-1
  • \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

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000771.bin
149e9f41beed84394409c98f54a888e9eeb69f462def2bc471f57fa312be86d0		 rtf-objdata-decoded RTF \objdata at offset 0x771 4182 bytes

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