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

Static analysis result for SHA-256 0f56f58e649dabe6…

MALICIOUS

Office (OLE) / .XLS

560.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-11
MD5: f3c0600e0452b88aea59a6c7cf17a6d3 SHA-1: 5abd463706a9a49249e348b3e77cdff515751180 SHA-256: 0f56f58e649dabe6f6e4347f5ecd907e82104793c3377f51bfb622ddd73c17bc
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link T1566 Phishing T1566.001 Spearphishing Attachment T1059 Command and Scripting Interpreter

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This vulnerability is commonly used to deliver secondary payloads. Although the VBA macros themselves contain no executable statements, the presence of the Equation Editor exploit object strongly suggests an attempt to compromise the user's system.

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 3

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
aebfa3cc9cffd1af88424a4828f90c2a91932c7006bd1640e9ae65f18d99a7e2		 ole-package OLE Ole10Native stream: MBD004D1FB2/Ole10Native 167172 bytes
ole10native_01.bin
1d9c55c7be39e369e1052a783b76e496580153cd531f7577c07aff83a4799ab0		 ole-package OLE Ole10Native stream: MBD004D1FB4/Ole10NaTivE 1818 bytes

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