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

Static analysis result for SHA-256 8fad6ced2dd7f10f…

MALICIOUS

Office (OLE) / .XLS

1.55 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-12-06
MD5: ec2840c1c01838755bd0b51e9af7ca9c SHA-1: bc09ceed377863d44d702eb9cd883403d9593aec SHA-256: 8fad6ced2dd7f10f099d5727eee822d2b67b57075011171cbdbd877b89f5edfb
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File: Exploitation for Client Execution

The file is an Excel spreadsheet containing an embedded Equation Editor object that exploits CVE-2017-11882. This vulnerability allows for the execution of arbitrary code when the object is processed. No VBA macros were found to be executable, but the presence of the vulnerable OLE object is a strong indicator of malicious intent. The primary IOC is the file's SHA256 hash.

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
f5c8ee0bbd5436ba8031832e7e18b4ff0e164b92bfb69ee4ed9b27e64b7336d4		 ole-package OLE Ole10Native stream: MBD00E510BD/Ole10Native 1571 bytes

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