Office (OLE) / .XLS malware analysis — malicious · 2665105b0eff8361

MALICIOUS

Office (OLE) / .XLS

396.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2026-06-04

MD5: 062d895bf23c70c5d274610d98cafff2 SHA-1: 5be55c8f82ccf413ac6d2d8bb886bd61a3dbdf3a SHA-256: 2665105b0eff836175deb9c326987d1b469de1c062932e80d906161d0f35eb48

148 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates that this Excel file contains a malicious payload exploiting the Equation Editor vulnerability. The presence of VBA macros, though not executable, suggests a potential for further malicious activity. The file's purpose is to leverage this exploit for initial execution.

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 ECX) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP ECX)
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` `17f505c5095640c71e15d323a1cc4a3148b992f2692b8c81f659b0e5b6e1b135`	ole-package	OLE Ole10Native stream: MBD00D198EB/OLE10nAtIvE	1986 bytes

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