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

Static analysis result for SHA-256 fdc933039af067d9…

MALICIOUS

Office (OLE) / .XLS

750.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-21
MD5: 59f2256a6136b5a343e8767cff479bdb SHA-1: 0174dcf3aced6df1565547147887150c7c6ccd8a SHA-256: fdc933039af067d9d28c8b9784b434516fbb7e24ebdb6e977a65c93f84ecaece
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1566.002 Phishing: Spearphishing Link

The sample is an Excel file containing a malicious OLE object that exploits CVE-2017-11882 in the Equation Editor. This vulnerability is known to be used to deliver arbitrary code execution. No VBA macros were found to be executable, and the document body was unreadable, but the critical heuristic firing directly indicates the 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
d43f12da922c548e7a8bb8b6e40e36361e01cda5264f3732394764f4dd93e416		 ole-package OLE Ole10Native stream: MBD01DF7E2C/oLE10NaTIVe 2199 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.