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

Static analysis result for SHA-256 fa42813abd6c5745…

MALICIOUS

Office (OLE) / .XLS

569.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-15
MD5: f3dc8e465cd24969fc5c62abb2a9f3de SHA-1: a0643fc4fb6f7ba6dd6817af6d91a5e7a39edc14 SHA-256: fa42813abd6c5745de1aeb57b7540ff74f4d278b91a6fe343c6fd9ca99b4eb84
108 Risk Score

Malware Insights

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

The sample is an Excel file containing a malicious OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability allows for arbitrary code execution when the object is processed. No VBA macros were found to be executable, but the presence of the Equation Editor exploit is a strong indicator of malicious intent.

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
3647c1f14bd5abcfa500fec3c0486f4f81dee7d47f2a79c0e4b65a496893f6ca		 ole-package OLE Ole10Native stream: MBD01A60CAE/oLE10NAtiVE 1936 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.