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

Static analysis result for SHA-256 8b6f3f934ee0ff50…

MALICIOUS

Office (OLE) / .XLS

230.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-04-28
MD5: 0905bfe04230a4fd076307bda8641e29 SHA-1: 1d8ce4b937eca4ff0ba604326003db322c5b21e0 SHA-256: 8b6f3f934ee0ff505218f9c46229fa7e5b6af9263e4d9a58a408e582abeb78f6
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 that exploits CVE-2017-11882. While the VBA project contains no executable statements, the presence of the Equation Editor OLE object strongly indicates an attempt to leverage this known vulnerability for initial execution. The specific payload is not detailed in the provided evidence, but the exploit itself is the primary indicator of malicious intent.

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
e9b0000c501a3a6b552fe3cea8587a6143b9e8456c98e4713bd36893b03e3e54		 ole-package OLE Ole10Native stream: MBD02C52F07/oLE10NAtIve 1529 bytes

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