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

Static analysis result for SHA-256 31ff0cd42f944af5…

MALICIOUS

Office (OLE) / .XLS

1.42 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-10
MD5: 5313813cb5881cb0d0583152ae4bf90d SHA-1: 987f333c641eb2dd1fa2c428ec5922069aad539f SHA-256: 31ff0cd42f944af57619cb0461c35b13938ed8982f9051d38f0eec0bc732cba2
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution

The critical heuristic firing indicates the presence of a payload exploiting CVE-2017-11882 within an Equation Editor OLE object. This vulnerability allows for arbitrary code execution when the document is opened. No VBA macros were found to be executable, and the document body is minimal, suggesting the primary attack vector is the embedded exploit.

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
18ce3bc17bf8430147861f897bace13741c9bbc1ae92172967de9505b3113b98		 ole-package OLE Ole10Native stream: MBD004216F0/oLE10naTIVe 1651 bytes

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