Malicious Office (OLE) / .DOC — malware analysis report

Static analysis result for SHA-256 bb537daece175aaf…

MALICIOUS

Office (OLE) / .DOC

866.5 KB First seen: 2022-06-22
MD5: fe3cc864654685ca2797522ff4abf88b SHA-1: 8987a297074ddaa50639160960ccf40a0cfb708d SHA-256: bb537daece175aaf0a0bcc73f9c0048518d2dd2f17215ef4ae428815be90921a
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is a Microsoft Word document containing an embedded Equation Editor object. Static analysis identified a critical heuristic firing for CVE-2017-11882, indicating the exploitation of a known vulnerability within the Equation Editor component. This vulnerability is commonly used to execute arbitrary code. The embedded ole10native artifact is the payload delivered via this exploit.

Heuristics 2

  • Equation Editor Ole10Native payload — CVE-2017-11882 critical CVE likely CVE_2017_11882_EQUATION_OLE10NATIVE
    An embedded Microsoft Equation 3.0 object (CLSID 0002CE02-0000-0000-C000-000000000046) carries an Ole10Native packager stream instead of the normal Equation Native/MTEF data. This is the weaponized Equation Editor RCE delivery shape used by CVE-2017-11882 / CVE-2018-0802 maldocs. The payload (font-record overflow + shellcode) is frequently encrypted and the stream name case-scrambled to evade scanners, but an Equation object holding an Ole10Native stream has no benign use.
  • Equation Editor OLE object high CVE related OLE_EQUATION_EDITOR
    Contains Equation Editor object — related to CVE-2017-11882 / CVE-2018-0802 exploitation, but CLSID presence alone is not the malformed MTEF exploit primitive.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin
094fbd736d81855178a62bc9ab9311dad2a8c017d0adb42a6a1253af846c75c6		 ole-package OLE Ole10Native stream: olE10NAtiVE 878020 bytes

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