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

Static analysis result for SHA-256 73c36ef834d585d4…

MALICIOUS

Office (OLE) / .DOC

1.06 MB First seen: 2022-08-09
MD5: f5339a335ff1241a031d48f86b75c35b SHA-1: 264a2dfd6c3d86530c677591e34bb484b23f6ec5 SHA-256: 73c36ef834d585d4b9997ec7790f57656d0eca761460e0e3c1fabcfa4c731aec
140 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model Hijacking

The sample contains an embedded Equation Editor object that leverages the CVE-2017-11882 vulnerability. This exploit is commonly used to deliver a second-stage payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests the document may also attempt to trick the user into opening a password-protected archive, further indicating a malicious delivery mechanism.

Heuristics 3

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin
86ab3be6ddc92219902949f43a915cd815029b6a1e92a045609f65c0a5d1db19		 ole-package OLE Ole10Native stream: OLe10naTiVE 1104179 bytes

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