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

Static analysis result for SHA-256 abcfb17db9de592b…

MALICIOUS

Office (OLE) / .XLS

269.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-01-24
MD5: b2942cf780aaf78c38c3e36873449b27 SHA-1: aa58f0ae7ef74d2f19773fd516bb8fd375e76626 SHA-256: abcfb17db9de592b3e4bf0964f3f45e3ed038ecd190599c67fe79c5bb9e9c035
108 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 sample contains a malicious OLE object exploiting CVE-2017-11882 in Microsoft Equation Editor. This vulnerability is known to be used to deliver arbitrary payloads. No VBA code was found to be executable, but the OLE object itself is the primary attack vector. The SHA256 hash is included 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
f0528f9d7c96d649fbfd979dba7d795cfdc1444d9d94c5dfccf9cc1b5fbbacf4		 ole-package OLE Ole10Native stream: MBD0139E3C5/OLE10NaTivE 1991 bytes

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