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

Static analysis result for SHA-256 b7062983e7667a1b…

MALICIOUS

Office (OLE) / .XLS

523.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-14
MD5: 44fc10c3b6cc2f42d2dacd19f9219915 SHA-1: c601f9d1993c4e5b2902571780ec5ff3ac220cfa SHA-256: b7062983e7667a1b86c1bd1123bc3aac29b7a8200b079c9bc4b566dd1c7ee44d
108 Risk Score

Malware Insights

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

The critical heuristic firing indicates the presence of a CVE-2017-11882 exploit targeting Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when the malicious OLE object is processed. No VBA macros were found to be executable, suggesting the exploit is directly embedded within the OLE object.

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
1997a7c90fc0f146aa7def205ee0d6d6d8f50809038077fdfd7aa97c5c51e3e2		 ole-package OLE Ole10Native stream: MBD0120CEFF/OLe10nAtiVe 1684 bytes

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