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

Static analysis result for SHA-256 cedca3fdf7c71fbd…

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: ebec43025b80c13f6cb6f824f1d84679 SHA-1: 6864ebeffa646f31672caabeba732d6612986d8a SHA-256: cedca3fdf7c71fbd38e6edacb60b8b46dcd773f7b347abdd46b4f9e702c80d3f
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.002 Malicious File T1059 Command and Scripting Interpreter T1059.005 Visual Basic

The critical heuristic firing for CVE-2017-11882 indicates that this file exploits a vulnerability in the Equation Editor OLE object. This technique is commonly used to deliver a secondary payload. The VBA macros are present but do not 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 ESI) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP ESI)
  • 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
7393fbe21a081918789d9e39db05ff73d8a3c15c37df5174c6345fde95079883		 ole-package OLE Ole10Native stream: MBD01848AC3/Ole10natIve 1418 bytes

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