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

Static analysis result for SHA-256 c4dc0ec3a7dea8df…

MALICIOUS

Office (OLE) / .XLS

288.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-07
MD5: 0797bb2e8660f4bb2ae56ec1f8a3b5f0 SHA-1: 0f247ba0a36937192d2cf212d94563cd7ab36d3e SHA-256: c4dc0ec3a7dea8dfbe6f4db526ff74cfc3b425c8120db9329ce2ac92f88e1279
140 Risk Score

Malware Insights

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

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that this sample leverages a known vulnerability in Microsoft Equation Editor. The presence of an Equation Editor OLE object further supports this finding. The exploit likely leads to arbitrary code execution.

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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
ole10native_00.bin
1312e2cae314e43e1b59f2e083372676d526c511bfda0918f079e48b9707c9bd		 ole-package OLE Ole10Native stream: MBD0134AE4B/Ole10Native 9830 bytes
ole10native_04.bin
45f657068376f276b7dda01e02d866e7cf3fdc7005aa897a5d8825fe12165aac		 ole-package OLE Ole10Native stream: MBD0134AE4F/Ole10Native 9818 bytes
ole10native_06.bin
a4ac8c170b6026e643d0676f0d4a10dd347ed7333d52729e37351eddd1b96a98		 ole-package OLE Ole10Native stream: MBD0134AE51/olE10NaTive 1369 bytes

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