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

Static analysis result for SHA-256 c31afa3ae7373caa…

MALICIOUS

Office (OLE) / .XLS

197.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-03
MD5: e9f9ebb75a32bc67534a7630b2ae04bc SHA-1: abdc09aeea046cec46d0b4b9139717a01f9afd79 SHA-256: c31afa3ae7373caaeccf7ba8c77431ab0357b35ddd5d4a75c6c8a80fb1e2fa99
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This technique is commonly used to execute arbitrary code, likely to download and run a secondary malicious payload. The presence of an OLE object further supports this attack vector.

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
08e2524ade04dd0a75532f97997261cde3b8c30c9e3204fff49c51b1ed9f7c88		 ole-package OLE Ole10Native stream: MBD03FA7A6F/OLe10nATIVe 1652 bytes

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