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

Static analysis result for SHA-256 2c65eac027039664…

MALICIOUS

Office (OLE) / .XLS

239.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-10-20
MD5: 3f7b8af73e4adfe572795a866efaa4ec SHA-1: 2608df3b40ed38e48f7067fba1bbddbab1b8d169 SHA-256: 2c65eac027039664195a9a7fb674311df997c18d3e5bfa4d2488438673a5c87e
140 Risk Score

Malware Insights

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

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This is further supported by the OLE_GETPC_CALL and OLE_EQUATION_EDITOR heuristics. The embedded OLE object likely contains a payload designed to be executed upon opening the document, exploiting this vulnerability to compromise the system.

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 EBX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EBX)

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin
2788bf94e4a226be65eac051c5ff3482c8611d6a07be5a98df9ab7bbd6d8f572		 ole-package OLE Ole10Native stream: MBD0463D216/oLE10NatIve 1383 bytes

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