Malicious RTF / .OLE — malware analysis report

Static analysis result for SHA-256 a6551cbd71d19656…

MALICIOUS

RTF / .OLE

11.2 KB
MD5: bb926f66fdc24bb1cf74308c4a52db8a SHA-1: 4a1e3eef44c9e3718d8bcf1b28c67205d3853731 SHA-256: a6551cbd71d19656a77caff80e451a34c48a9c0543ae300124b49eef4abdfb03
180 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.001 PowerShell

The file is an RTF document containing an embedded OLE object, specifically targeting the Equation Editor. Heuristics indicate exploitation of CVE-2018-0802, a known vulnerability in the Equation Editor component. This vulnerability allows for arbitrary code execution, which is then likely used to download and execute a second-stage payload. The ClamAV detection further confirms the malicious nature and points to the specific CVE exploited.

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_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 1 \objdata section(s) — embedded OLE objects

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
objdata_00_off00000e14.bin
6f14ab1c5adf2b47d98ed04a76b69909e23c929c79a1ce68304a2502eb1c3681		 rtf-objdata-decoded RTF \objdata at offset 0xE14 3653 bytes

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