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

Static analysis result for SHA-256 3d84c3142ceb5672…

MALICIOUS

Office (OLE) / .XLS

1.25 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-17
MD5: d3d3fd92bf59b7d9493e6d5124def0a0 SHA-1: e6dc366b9b89233aba66561108dc84fbaf8b72e1 SHA-256: 3d84c3142ceb5672663c31c626240b3bf38f522407564c23afc88b60b6b4f095
148 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor OLE object, which is a known vector for exploiting CVE-2017-11882. This vulnerability allows for the execution of arbitrary code upon opening the document. No VBA macros were found to contain executable statements, but the critical heuristic firing indicates the Equation Editor payload is present and likely malicious.

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
33becd2dbd092488af88c85bbbe4391a0b196b0185267d67afa673c8420ed2f5		 ole-package OLE Ole10Native stream: MBD022A4381/OlE10NatIvE 1739 bytes

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