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

Static analysis result for SHA-256 879d34c9515e8587…

MALICIOUS

Office (OLE) / .XLS

1.55 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-06
MD5: 9e3cf93cfcd140df3fb008c6e5d30be5 SHA-1: a926daa3aca6dcc338a6a6c8d1054e3ed3494620 SHA-256: 879d34c9515e8587ad27bd40ded3c62820c027f0d4e49ea93a7c8cc5daa82e7f
108 Risk Score

Malware Insights

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

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. While the VBA macros themselves appear empty, the embedded OLE object is the primary vector for exploitation. This suggests the file is designed to leverage this known vulnerability for initial execution.

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
1e6c4ba5b5b2b410f1949a4466b797e3ccd46ceffcb2f448d472a5e69ece9cbd		 ole-package OLE Ole10Native stream: MBD011A8062/oLE10NAtIVe 1678 bytes

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