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

Static analysis result for SHA-256 9b81d5a774c8e6ee…

MALICIOUS

Office (OLE) / .XLS

1.08 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-30
MD5: 47325c14fe5c22486ed25c43367779ba SHA-1: 17a51494cd6492da17d15b40562ba223118c31f0 SHA-256: 9b81d5a774c8e6ee7bceed2661e9f58b600c75aac7027d92521201a28b7882d7
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the file exploits a known vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution, typically used to download and execute a secondary payload. No VBA macros were found to be executable, and the document body was unreadable, suggesting the exploit is the primary vector.

Heuristics 3

  • 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.
  • 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
ed8da65f0f0a4cc2a905cfcf1ae916bf05ced375ebeefae9a837c8bf84ad6699		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 3618 bytes
ole10native_00.bin
bb7bad934ea46ffc5a97e5110df4815af82f91eb1189334f7de957217fbf7232		 ole-package OLE Ole10Native stream: MBD017F71F5/OLE10nAtIve 2283 bytes

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