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

Static analysis result for SHA-256 191254f5d9a61ca1…

MALICIOUS

Office (OLE) / .XLS

170.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-06-09
MD5: b44b94df840da5bae058ac996ef0a875 SHA-1: 2debf9c96fd3d0eb5d60ee637660aa4db4933d8b SHA-256: 191254f5d9a61ca1cd6df8818d1d57bf2d9f68dc30bb53da450f84745a8580e6
148 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1059.005 Visual Basic

The sample is an Excel file containing an embedded Equation Editor OLE object, which is a known vector for exploiting CVE-2017-11882. The critical heuristic firing confirms the presence of a payload associated with this vulnerability. While no VBA macros were found to contain executable statements, the presence of the exploit object strongly indicates an attempt to execute arbitrary code.

Heuristics 4

  • 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.
  • x86 GetPC stub (CALL $+5; POP EDX) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDX)
  • 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
3949f2cb292af8941f1baa1c717634c4abbdaefd6d0d6b935436a3a27ceddc9e		 ole-package OLE Ole10Native stream: MBD00DDD8FB/ole10NATiVE 1545 bytes

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