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

Static analysis result for SHA-256 85fbfcbefbd33af6…

MALICIOUS

Office (OLE) / .XLS

1.85 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-22
MD5: 14a0665cc8b44032ed6d6c9bfdf9fb4d SHA-1: ba61ea4c5fd4a16ed92cc7eea187ecbf5841a2f0 SHA-256: 85fbfcbefbd33af6be5388463da06f8462f92c9dac4ddb06689ad65d58c37077
150 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1204.002 Malicious File: Malicious Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a known vulnerability in the Equation Editor OLE object. The presence of an embedded OLE object and the 'Password-protected archive handoff' heuristic suggest the file is designed to trick the user into opening a password-protected archive, which likely contains the actual malicious payload. No VBA macros were found to be executable, but the OLE object itself is the primary vector.

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://schemas.openxmlformats.org/drawingml/2006/main

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
d50e309a869581078d17c64d068aa18be31d54ed51f807b969ddf183f849fe2a		 ole-package OLE Ole10Native stream: MBD01054C2A/OlE10nATiVe 914022 bytes

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