Office (OLE) / .XLS malware analysis — malicious · b8d1741d82670995

MALICIOUS

Office (OLE) / .XLS

511.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-15

MD5: 984d5be469d74c236d63b8058fd0c129 SHA-1: f550eee5c6dbf766b1055af9abb68e6e8030321f SHA-256: b8d1741d826709951f5f4500548053319997c7da5703fb6172b1ab3146ad84ea

148 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that the sample contains a payload designed to exploit this specific vulnerability in Microsoft Equation Editor. This vulnerability allows for arbitrary code execution when a specially crafted OLE object is processed. The presence of an OLE Equation Editor object further supports this attack vector. No VBA macros were found to contain executable statements, suggesting the exploit is directly embedded within 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` `7c16cd47c31bd61beea061bbf0ac51258022099ee14e9fd94bc8efabe2ae3c58`	ole-package	OLE Ole10Native stream: MBD01776D9C/oLe10naTIVE	1785 bytes

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