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

Static analysis result for SHA-256 4b8db0de947cf2f0…

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-08
MD5: ce559558f98fcb711292369e30d3f93f SHA-1: fb6dd05adbd06a057aa70a9fef57d8d707db71d7 SHA-256: 4b8db0de947cf2f0f3c67cd370878d04919a41b97e97be67b2f17258cf07e72e
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 that the file contains a payload exploiting this specific vulnerability. The presence of an Equation Editor OLE object further supports this. While no VBA macros were found to contain executable statements, the exploit itself is designed to achieve code 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
8b376832e0f3f12bdf340d673c6f1e7a157e5d1807455dd7459e409528504e7d		 ole-package OLE Ole10Native stream: MBD0156C4B2/OlE10NATIve 1464 bytes

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