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

Static analysis result for SHA-256 e33e207971d05a65…

MALICIOUS

Office (OLE) / .XLS

1.01 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-23
MD5: 121e603042747acbd8d1fb2c55eaf080 SHA-1: 4a3d57363b240fd6644d9bc0f6abca7ec9cf3992 SHA-256: e33e207971d05a656690c2ebd86e3f090f3e50d37b16320a69bc5c92f4402cd5
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File T1059.005 Visual Basic

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This, combined with the presence of an OLE object and VBA macros, strongly suggests a malicious document designed to exploit this vulnerability. The embedded OLE object likely contains the exploit code, and the VBA macros, though appearing empty, could be used for further stages or obfuscation. The file's SHA256 hash is included as an IOC.

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
3eed34a69d25bb6a96974b6f663385cd3482a19ff6a860a5b720948ceeb12aec		 ole-package OLE Ole10Native stream: MBD026E9B3C/oLe10natIvE 1414 bytes

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