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

Static analysis result for SHA-256 80a49a6607c58343…

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: 99b398f18e133c35b76c92e5955aff7a SHA-1: 7678a14d8de8252f4f06b997daacb5a0275af532 SHA-256: 80a49a6607c583435114f26fbb0302d78e53dfcf2273f7fa2f60f3044a893f8c
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017-11882 indicates that the sample contains a payload within an Equation Editor OLE object, a known exploit vector. The presence of VBA macros, though marked as not containing executable statements, suggests a potential for further stages or obfuscation. The file's structure and the specific exploit identified point towards a delivery mechanism for a secondary payload.

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
8a363aa5ce1152eb53af40bd9696c6eb9c800609a3b1852c5a49341bc37d83a0		 ole-package OLE Ole10Native stream: MBD018562FC/OLe10Native 1665 bytes

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