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

Static analysis result for SHA-256 a7f71bbcd392ecbb…

MALICIOUS

Office (OLE) / .XLS

813.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-28
MD5: d9536e0ffba3321e201e6b3972d21076 SHA-1: cc85f48e84bc43aff112e774a6f88e6568f65639 SHA-256: a7f71bbcd392ecbbbdefe8c3941fdbe3937250c387af3af4a694cd99ad2da36c
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a vulnerability within the Equation Editor OLE object. This technique is commonly used to achieve arbitrary code execution. While no VBA macros were found to contain executable statements, the presence of the Equation Editor exploit object strongly suggests a malicious intent to compromise the user's system.

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
1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 2412 bytes
ole10native_00.bin
9ac6b5497898a3af6a40f610e5c86f8434aecf471664c21d92fbb3a2fd5e8926		 ole-package OLE Ole10Native stream: MBD0130B610/olE10NaTIve 1729 bytes

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