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

Static analysis result for SHA-256 bdf26fed9c2fe05f…

MALICIOUS

Office (OLE) / .XLS

285.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-10-28
MD5: 34d61034f9976be13fbc5fd3e04dbafc SHA-1: e1d0a76d6bbb9c78c65af55c9e1d682502d41a94 SHA-256: bdf26fed9c2fe05fd927d157df3ea4bbb07c024f68db2e3615776b0bdbee75e1
100 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link T1204.002 User Execution: Malicious File T1059.003 Windows Command Shell T1059.001 PowerShell

The sample is an Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability is known to be used to deliver malicious payloads. The presence of the ole10native artifact strongly suggests that the Equation Editor object contains an embedded executable or script designed to be run by the user.

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
7bf61033d61f7f608e20609d94fd4827cc3f4fe3035fd92f3c726421e9f0c839		 ole-package OLE Ole10Native stream: MBD023C29F8/oLE10nATIve 1744 bytes

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