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

Static analysis result for SHA-256 b5f7bc8ce9f09f5c…

MALICIOUS

Office (OLE) / .XLS

174.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-20
MD5: 43bc668c1dcf962941d09f6bd22325e8 SHA-1: 83695c6050d20698b470736cf8e62fa83a9707cb SHA-256: b5f7bc8ce9f09f5c2a23c9d0379cc065ff1b800abb45955de8ef086aeb88bf8c
108 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1059.005 PowerShell

The sample contains an embedded Equation Editor OLE object that is known to be vulnerable to CVE-2017-11882. This vulnerability allows for the execution of arbitrary code upon opening the document. While no VBA macros were found to be executable, the presence of the vulnerable OLE object strongly indicates an exploit attempt.

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
668c48977a9b63db40ed9c7e03a5815db8d549d04327bfab8fd4ee13dbf95c4a		 ole-package OLE Ole10Native stream: MBD006DA5FF/Ole10NaTiVe 1405 bytes

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