Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 56f8d8a26b606472…

MALICIOUS

RTF / .DOC

171.9 KB
MD5: fec5264e6e4e5aa8d46e4f12ddd91b42 SHA-1: 59c9e51cb848d150f68eddfbe1c4f8126a813075 SHA-256: 56f8d8a26b6064726c8bd673573dfd0a9344b642de59f6e65eb3748c08d32312
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is an RTF document that contains embedded OLE object data, specifically triggering heuristics related to Equation Editor exploits. The critical ClamAV detection explicitly identifies it as Rtf.Exploit.CVE_2017_11882-6584355-1, indicating a known vulnerability exploitation. This suggests the primary attack pattern is leveraging CVE-2017-11882 via a malicious attachment to achieve arbitrary code execution.

Heuristics 5

  • Ole10Native stream in RTF OLE object high CVE related RTF_OLE10NATIVE_STREAM
    RTF contains an embedded OLE object with an Ole10Native stream. This is a strong payload-container signal and is related to Word/OLE exploit delivery, but it is not specific enough on its own to assign a CVE.
  • 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 2 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off000000a4.bin
af67c5b172187de0eb4ae827717c045475175be5ba4a258e8fd2fbac0418cc76
rtf-objdata-decoded RTF \objdata at offset 0xA4 59295 bytes