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

Static analysis result for SHA-256 55ff6af0878a1972…

MALICIOUS

Office (OLE) / .XLS

1.54 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-05
MD5: cb7a8ff080dc34d106c5e30183533e32 SHA-1: eaa70edd58aa0aebaf3fbf004c8721e2c2136057 SHA-256: 55ff6af0878a19727cf57a49f3860843d7ab88356b6c4d8557499401f80effc1
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The sample is an Excel file containing an embedded Equation Editor object, which is known to be vulnerable to CVE-2017-11882. This vulnerability allows for the execution of arbitrary code. While no specific VBA code was extracted, the presence of the vulnerable OLE object strongly indicates exploitation for initial execution. The file's SHA256 hash is provided as an IOC.

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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
d2e0377d7438e68ef4120c753eebc9851001bec16e1517345e5f084630f6a779		 ole-package OLE Ole10Native stream: MBD00B6FF1B/Ole10Native 1733 bytes

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