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

Static analysis result for SHA-256 2c52e087252bf724…

MALICIOUS

Office (OLE) / .XLS

511.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-14
MD5: 45790aad9dc82b03e033b2d7cbfb9f29 SHA-1: fdbf48024c071036769845b3b4486f7629549553 SHA-256: 2c52e087252bf72482dc98bc46f29f61bd46145abc9757957538a78288aa1d89
148 Risk Score

Malware Insights

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

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a known vulnerability within the Equation Editor OLE object. This technique is commonly used to execute arbitrary code. No VBA macros were found to contain executable statements, suggesting the exploit is directly embedded within the OLE object.

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
bcae0724f02b0096a95f2b047e448d9d5bf80c5a9f99a73102d395e49eebeaa9		 ole-package OLE Ole10Native stream: MBD0148294B/Ole10NATivE 1567 bytes

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