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

Static analysis result for SHA-256 015070adc48ca00e…

MALICIOUS

Office (OLE) / .XLS

157.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-05-25
MD5: 2afa5f8b900075c8275d482bd28d9f76 SHA-1: 65ca143d36ccff4f1e1824b5f8e9f6c09d858dcf SHA-256: 015070adc48ca00eaa9fa61df9194059c1758c2502fdb0900bf686c8e3ddd6c7
148 Risk Score

Malware Insights

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

The sample is an Excel file containing an embedded Equation Editor OLE object that exploits CVE-2017-11882. This vulnerability is known to be used for arbitrary code execution, typically to download and execute a second-stage payload. No VBA macros were found to be executable, but the presence of the vulnerable OLE object is a strong indicator of malicious intent.

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 EDI) high SC_GETPC_CALL
    x86 GetPC stub (CALL $+5; POP EDI)
  • 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
f8997c50ed7dc7116936303afde1425617aa73df517095a1362cbec758728f47		 ole-package OLE Ole10Native stream: MBD00815764/ole10NativE 1662 bytes

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