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

Static analysis result for SHA-256 835734079549b693…

MALICIOUS

Office (OLE) / .XLS

805.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-03-11
MD5: bcb654e93d258ecf0cab1db0f7cbcabe SHA-1: 81a9e0422d1ffe62f77060496d318863cf3307c8 SHA-256: 835734079549b6932e3512b705eb51e4b051622f81f3e541f1ed041c2fb8b813
148 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the presence of a payload designed to exploit this specific vulnerability. The presence of an Equation Editor OLE object further supports this finding. No VBA macros were found to contain executable statements, suggesting the exploit is directly embedded within the OLE object.

Heuristics 4

  • 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 EDI) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDI)
  • VBA project contains no executable statements low OLE_VBA_MACROS
    Document contains a VBA project, but extracted modules only contain attributes/options/comments and no executable statements.

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
9f237a9ddea45d009a2a81f084f15ae3e6445f7ae7a617bf5ca81fc8b71dbb22		 ole-package OLE Ole10Native stream: MBD00BFC670/OLE10naTive 1785 bytes

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