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

Static analysis result for SHA-256 6be54d940631a661…

MALICIOUS

Office (OLE) / .XLS

1005.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-03-02
MD5: 9de01212598c735e4542bbd67c72e1fb SHA-1: c35de70258e604b6910e4686f91b90e855ac66ae SHA-256: 6be54d940631a66161b2ecdb805200f2b7fe9abf2e0c8f18179a0d59b0380a5d
148 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 Malicious Link T1059.005 Visual Basic

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a vulnerability within the Equation Editor OLE object. This exploit is commonly used to deliver secondary payloads. No VBA macros or executable code were found, suggesting the primary malicious functionality resides within the Equation Editor object itself.

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
0bedd32ea8c7bec8ef74cc8e5bea59e33d01f9a02d0a98c97ddecca9bc6aa980		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1812 bytes
ole10native_00.bin
1aad94a447b6dff7cb0c7a6bfcc27bccaf4fa1a56d427b09490a8c797dbc0e53		 ole-package OLE Ole10Native stream: MBD000F2BD7/OlE10naTive 1472 bytes

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