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

Static analysis result for SHA-256 4bbd1fff32b30b86…

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-08
MD5: 6dab04c9980d7441a33eb82e97887bfa SHA-1: b3e43fa58bb3e22ac22e5af96e383fded931c4bb SHA-256: 4bbd1fff32b30b86b1f549be8ca06d565ebaa82c0d19f0df4897fdb0855ba7d5
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for arbitrary code execution when the object is processed. While no VBA macros were found to be executable, the presence of the vulnerable OLE object strongly indicates an attempt to exploit this known vulnerability for initial access.

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
669d923666b664fad5a868a9fa6b66d9e962fe6cfa022a54bc7cfab196e12df7		 ole-package OLE Ole10Native stream: MBD015C50F4/oLe10NAtiVE 1496 bytes

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