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

Static analysis result for SHA-256 0c93f6b8ba9d3b71…

MALICIOUS

Office (OLE) / .DOC

1.00 MB First seen: 2023-08-28
MD5: 1408c7d11a295598cf3d5b9abe1afc81 SHA-1: 11e94c0294e6a8ed9c71e0dc941447add10c2b77 SHA-256: 0c93f6b8ba9d3b710daa9ab8a07a903dd6d9a3bd9035c67926adbcb96e76e74a
140 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample contains a critical heuristic firing for CVE-2017-11882, indicating exploitation of a vulnerability in the Equation Editor OLE object. This technique is commonly used to deliver a second-stage payload. The presence of the Equation Editor OLE object and the GetPC stub heuristic further support this attack vector.

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.
  • x86 GetPC stub (CALL $+5; POP EDI) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDI)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin
d14d51ad46f689c0b873151f2812c76355f748ccd05ce3b5d8b606309b7dff8e		 ole-package OLE Ole10Native stream: oLE10naTIve 1038101 bytes

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