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

Static analysis result for SHA-256 fddffc2da12d6b53…

MALICIOUS

Office (OLE) / .XLSX

165.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-02
MD5: 0ef94b8f7b2fe3ee0867ac0c98cc67ee SHA-1: 5f76e47eb3d607784309bb32acba34c9c3f8e8b4 SHA-256: fddffc2da12d6b53ed9f41ad231dd23298a1de8bf78945a9694e3b03fc83bef8
100 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1559.001 Component Object Model Hijacking

The critical heuristic firing indicates the presence of a payload associated with CVE-2017-11882 within an Equation Editor OLE object. This exploit is commonly used to achieve arbitrary code execution. The embedded OLE objects are likely components of this exploit chain.

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: MBD027CEF2B/Ole10Native 9818 bytes
ole10native_06.bin
d90f506d2c87f9a47cc8c12a244a815140ea8f95fec11741ddcbf8f8e86dfb8e		 ole-package OLE Ole10Native stream: MBD027CEF31/olE10NAtIve 1598 bytes

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