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

Static analysis result for SHA-256 c46fb3ff9b182ca4…

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: f64871d4672a63c91fc8669d4294d75a SHA-1: 30b76380cfb867117a8c2ca46ac928efb7c49fc3 SHA-256: c46fb3ff9b182ca43e59e8b02e3345c23ad41adb6977b57f235bb99d5d5be77f
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates that this file contains a payload exploiting a vulnerability in the Equation Editor OLE object. The VBA macros were found to contain no executable statements, suggesting the exploit is directly embedded within the OLE object itself. This points to a direct exploitation attempt rather than a macro-driven download.

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.
  • 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
49dbfc32bb78c025adfd79fc8eab26472df8c64ff9d71f67941de58f8cf84a9a		 ole-package OLE Ole10Native stream: MBD01552679/Ole10NaTive 1648 bytes

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