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

Static analysis result for SHA-256 5589bcfad3eb74da…

MALICIOUS

Office (OLE) / .XLS

503.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-07
MD5: f995ee6cf1282fcd570b490a55b17355 SHA-1: e0d2ed2412eb4d09c9a2f05612c01ab93e75af03 SHA-256: 5589bcfad3eb74dac48659c6353f72b4a3aede02382d92f3180dc895181446d6
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that the sample exploits a known vulnerability in the Equation Editor OLE object. The presence of an OLE object and the specific CVE strongly suggest this is the primary attack vector. The document body appears to be a standard purchase order, likely used as a lure to entice the user to open the malicious content.

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
bcc2a1b85d84c9e4aa9a99a86394a62c709645fcd51ea2b791547740b5e37e48		 ole-package OLE Ole10Native stream: MBD018F484C/OlE10NAtiVe 1453 bytes

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