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

Static analysis result for SHA-256 0c070ae1208c5f6a…

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: b1eae5f8235dbfcf5079b7d42edf211e SHA-1: 739b56cdb766ece304e4d651e671cde529016ad1 SHA-256: 0c070ae1208c5f6af5a63b8caf5c52c68611a743f8ca22aa973f79cb91be338e
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that this file contains a payload exploiting the Equation Editor vulnerability. The presence of an OLE Equation Editor object further supports this finding. While VBA macros were extracted, they appear to be boilerplate and do not contain executable statements, suggesting the primary malicious mechanism is the embedded OLE object exploiting CVE-2017-11882.

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 EBX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EBX)
  • 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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
26a7d0c7ea207a92a6d8de8dc9c1af81e7632ac7243eee75e177e2bfe575420b		 ole-package OLE Ole10Native stream: MBD01831908/OlE10naTiVE 1864 bytes

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