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

Static analysis result for SHA-256 5b1c91aa4cdcf33f…

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-04
MD5: 8b4d99a23a5b2b7c0974f95c20691e14 SHA-1: 21a00cc06b15fc9faeee073566c1191285d88e5d SHA-256: 5b1c91aa4cdcf33f4c5c9a3270e9270219d1151d9d42a59a33f0aa7e4160f2c4
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious Link T1204.001 Malicious Link: Malicious Link T1566 Phishing T1566.001 Phishing: Spearphishing Attachment T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in the Equation Editor. This vulnerability is commonly used to deliver secondary payloads. Although no VBA macros were found to be executable, the presence of the Equation Editor OLE object strongly suggests an attempt to exploit this vulnerability for initial access. The file is an Excel spreadsheet, a common delivery mechanism for such exploits.

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
7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673		 vba-macro oletools.olevba.extract_macros (decoded VBA source) 1206 bytes
ole10native_00.bin
173c662c53b81ba05f673d65863390573b5ef4c70c40c593c9cd35999549fbd3		 ole-package OLE Ole10Native stream: MBD003BA4C3/OLe10natIVE 1564 bytes

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