Office (OLE) / .XLS malware analysis — malicious · 9d61779343426821

MALICIOUS

Office (OLE) / .XLS

393.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-10

MD5: 6a7c06df3a44d151fb54e86c4dd979cb SHA-1: b2d05b3c2abf9f540b9e7bfd609c1f5786c43490 SHA-256: 9d6177934342682172039ae3866343ef1118f511409799c62c040ec1355d8bd7

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious File T1204.002 Malicious File: User Execution T1559 Component Object Model Hijacking T1559.001 Component Object Model Hijacking: Component Object Model

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the file exploits a known vulnerability in Microsoft Equation Editor. The presence of an OLE object containing an Equation Editor payload further supports this. No VBA macros were found to be executable, suggesting the exploit is directly delivered via the OLE object.

Heuristics 4

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.
x86 GetPC stub (CALL $+5; POP EDI) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EDI)
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` `40208a7b27d2158e2c54af7b178a69f386bbca6210b5140869e99c9676346fbf`	ole-package	OLE Ole10Native stream: MBD021C746E/olE10NaTIvE	1224 bytes

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