Office (OLE) / .XLS malware analysis — malicious · 0071eb6283e22458

MALICIOUS

Office (OLE) / .XLS

393.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-04

MD5: e5818c35a5192a71bd146efbfd61cc39 SHA-1: 29b7ac1dc65a60e54c0d9ae7d0d959d150be3878 SHA-256: 0071eb6283e22458523f8d65c29db84739bbe65b9f4667b9eba4481e03b6e7e9

148 Risk Score

Malware Insights

MITRE ATT&CK

T1204 Malicious Link T1204.001 Malicious Link: Malicious File T1059 Command and Scripting Interpreter T1059.005 Command and Scripting Interpreter: Visual Basic

The critical heuristic firing for CVE-2017-11882 indicates that this Excel file contains a malicious Equation Editor OLE object designed to exploit this known vulnerability. The VBA macros are present but appear to contain no executable statements, suggesting the primary malicious functionality is within the embedded OLE object. This exploit is commonly used to download and execute a second-stage payload.

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` `777d8fd88c4529a83e2b3e98a3b3a79deff97d0f685863db49a3f262ba94341b`	ole-package	OLE Ole10Native stream: MBD003C96E9/OlE10nativE	1493 bytes

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