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

Static analysis result for SHA-256 2357e7e62dfb1073…

MALICIOUS

Office (OLE) / .XLS

394.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-08
MD5: 2970799a09831ca72d6b74c33a663b3a SHA-1: 042bfc8057f27b32703427046af5d4c594bc85ba SHA-256: 2357e7e62dfb107319190c9dcee48e2eebb6351dc14d9722680a98c9f7db226e
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 file contains a payload exploiting this specific vulnerability. The presence of an Equation Editor OLE object further supports this finding. While VBA macros are present, they do not appear to contain executable statements, suggesting the primary execution vector is the OLE object exploit.

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
2a5e484f8fe4b3e90eeb67b68b08a42e10ffec74a913005a172f26c92e46ff7b		 ole-package OLE Ole10Native stream: MBD018E7433/ole10NaTiVe 1388 bytes

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