Malicious RTF / .DOC — malware analysis report

Static analysis result for SHA-256 f75f3bfd3e18d29e…

MALICIOUS

RTF / .DOC

7.8 KB
MD5: 2339cd029b5111eaeb8028c8f528996b SHA-1: 267c48f3c197badfd078e22c6b65470d1f568fa0 SHA-256: f75f3bfd3e18d29e31ff3dc286bcc5c9ba147d49d01e87261cc71f76fd012e44
220 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1566.001 Spearphishing Attachment

The file is an RTF document containing embedded OLE objects, specifically triggering heuristics related to Equation Editor and OLE activation. ClamAV identifies this as Rtf.Exploit.CVE_2018_0802-6825822-0, indicating exploitation of the CVE-2018-0802 vulnerability. This vulnerability allows for arbitrary code execution when the embedded object is activated, likely leading to the download and execution of a secondary payload.

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_2018_0802-6825822-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Rtf.Exploit.CVE_2018_0802-6825822-0
  • \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_off000000a3.bin
ead608752acb1d35889a3bbf90a8a4b67abd006a64205974a05db162859aaaa2
rtf-objdata-decoded RTF \objdata at offset 0xA3 3640 bytes