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

Static analysis result for SHA-256 d503346bc1aef8cf…

MALICIOUS

Office (OLE) / .XLS

793.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-28
MD5: f1603f05bd5f40f03fe562209bfcc0b6 SHA-1: 755472a170bca6d5e9e1e5b21a9d512e6f74aedc SHA-256: d503346bc1aef8cfc0d98ac421a6f9edaaa11c64522c0bf45690293c9917efa5
108 Risk Score

Malware Insights

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

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the file exploits a known vulnerability in Microsoft Equation Editor. This vulnerability is commonly used to execute arbitrary code, likely to download and run a second-stage payload. No VBA macros were found to contain executable statements, but the OLE object itself is the exploit vector.

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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
743bfda71ad54d5613f3b281cba872c731608678d4be07ec42a2a5688baf448f		 ole-package OLE Ole10Native stream: MBD01AB8111/Ole10NaTIVE 1720 bytes

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