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

Static analysis result for SHA-256 6979da633dc5ee44…

MALICIOUS

Office (OLE) / .XLS

512.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-16
MD5: 8e0dccfc7fa47c3a0730acbf5417dbaa SHA-1: 93015773f4db346ef820a13b3080e62e87049532 SHA-256: 6979da633dc5ee44af765a3012b4fd18f17b507706266b9b2caad4eeab199031
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 the file exploits a vulnerability in the Equation Editor. The presence of an OLE object containing a payload further supports this. No VBA macros were found to be executable, suggesting the exploit is the primary delivery mechanism.

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
b133e85e649687f6891f3c2487ef80fd81ce9abb3f495fd5ae22646f9f371cb4		 ole-package OLE Ole10Native stream: MBD017B4150/OLe10natIVE 2105 bytes

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