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

Static analysis result for SHA-256 602fdfaca2acb0ad…

MALICIOUS

Office (OLE) / .XLSX

221.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-06
MD5: ba140575f444636137918707b2a07945 SHA-1: 92903c1427303ebcf7849b299e53ef752803f460 SHA-256: 602fdfaca2acb0ad0b3db39bec02ba51829cab885323958407eeeb3c48095d61
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. This exploit is commonly used to execute arbitrary code, likely to download and run a second-stage payload. The presence of multiple sheets in the Excel file is typical for such documents.

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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin
45f657068376f276b7dda01e02d866e7cf3fdc7005aa897a5d8825fe12165aac		 ole-package OLE Ole10Native stream: MBD01173FE5/Ole10Native 9818 bytes
ole10native_06.bin
d420dd849e8f762b9dc03d0fcf58640eeb92007530eaed379b27d18f9ebeba25		 ole-package OLE Ole10Native stream: MBD01173FEB/Ole10Native 1708 bytes

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