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

Static analysis result for SHA-256 2e058b8984481804…

MALICIOUS

Office (OLE) / .XLS

51.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-20
MD5: 37133cc863835f953a5c5d9a0a0e6380 SHA-1: a8d7e1140586a12ffd9be7d9bebddd94b6a71f21 SHA-256: 2e058b8984481804a1fee3fa5d5fbba17183f5cbceb1a97ad722fe441f168253
108 Risk Score

Malware Insights

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

The sample contains an embedded Equation Editor OLE object that is known to be vulnerable to CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is rendered. No VBA macros were found to be executable, and no document body was extracted, but the presence of the vulnerable OLE object is sufficient evidence of exploitation for client 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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
261d2a8420f5bd6a989b8fd13351c53ae2354558b32f33d03fba055ed582719c		 ole-package OLE Ole10Native stream: MBD00D05E1D/OLe10NaTive 1634 bytes

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