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

Static analysis result for SHA-256 b5bd46c761b969c2…

MALICIOUS

Office (OLE) / .XLS

848.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-18
MD5: 0f448497bd329f6e88bc0729157a6a90 SHA-1: 753c4d0be3b5e18b3f5e813d67bb69eb62733e1f SHA-256: b5bd46c761b969c270349f219dbb33f1fae3e8dc8e4fe1ec1bf527aebef1db51
108 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Phishing: Spearphishing Attachment T1204.002 Malicious File: User Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This technique is commonly used to deliver secondary payloads. The presence of VBA macros, though not executable in this instance, further supports a malicious document context. The file's metadata and the nature of the exploit suggest it is designed to trick users into opening it, leading to the execution of 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
d8a7a09ca6032aff79e4ff59ef9cc9f468b383741f323f3d0d03d2f26b2d7a7e		 ole-package OLE Ole10Native stream: MBD00D67661/Ole10Native 1481 bytes

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