Office (OLE) / .XLS malware analysis — malicious · f2c303e62b2117e8

MALICIOUS

Office (OLE) / .XLS

187.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-04-19

MD5: 8070a491dd7c19810caaba06981e9cbc SHA-1: c657fd48e0a2b46605cc3525c71fdbdfcb46c1e4 SHA-256: f2c303e62b2117e83dccecf754f0e67b4d826f56fa3171063ad70bb12e48e6e5

108 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 PowerShell

The sample is an Excel file containing an embedded Equation Editor OLE object. Heuristics indicate exploitation of CVE-2017-11882, a known vulnerability in Microsoft Equation Editor that allows for arbitrary code execution. No VBA macros were found to be executable, suggesting the exploit is directly within the OLE object.

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.

Filename	Kind	Source	Size
`macros.bas` `7f506327609c082af1cd37dde23bc2c71a000f7d1ef530b6abb66775040a7673`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1206 bytes
`ole10native_00.bin` `4f3de27d677004f05f1767254edd422e5d1be6be24e3758e82ed5f4882278db4`	ole-package	OLE Ole10Native stream: MBD01D3AFAE/OLE10naTivE	1504 bytes

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