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

Static analysis result for SHA-256 c47d92547a6068f4…

MALICIOUS

Office (OLE) / .XLS

569.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-15
MD5: bd559d0f21a1378f2cfae2548e2a1a09 SHA-1: 039fc8999686d7d62f80079ab36ddbb670b2eed2 SHA-256: c47d92547a6068f4f31ab92a03c8d4c973ab2ddfaa190abfdb042f0a52c4d446
108 Risk Score

Malware Insights

MITRE ATT&CK
T1204 Malicious File T1059.005 Visual Basic

The critical heuristic firing for CVE-2017-11882 indicates the exploitation of a known vulnerability within the Equation Editor OLE object. While the VBA macros themselves contain no executable statements, the presence of the vulnerable OLE object strongly suggests this file is designed to exploit this specific vulnerability to execute a secondary payload. The file's SHA256 hash is provided as an IOC.

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
fb7e03491293fb0cfd598acc700d8d31ece4aad6d907734bfd9af413064f8685		 ole-package OLE Ole10Native stream: MBD01B057DB/oLe10natIve 1533 bytes

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