Office (OLE) / .XLS malware analysis — malicious · a3d6bb9bcec84d97

MALICIOUS

Office (OLE) / .XLS

548.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-08

MD5: 4d0c7f86b0e57066396f5a7b96eb1a49 SHA-1: c8e04472398c857cc8eb9b20295a41eb151ea8c4 SHA-256: a3d6bb9bcec84d97233aefc0f3fa839119d1a9af04581c7874e07b1292dcd7a4

150 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution

The sample is an Excel file containing an embedded Equation Editor object, which is a known vector for exploiting CVE-2017-11882. The critical heuristic firing confirms the presence of a payload specifically associated with this vulnerability. While no VBA macros were found to be executable, the presence of the vulnerable OLE object is sufficient to indicate exploitation for client execution.

Heuristics 5

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 EDX) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EDX)
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.
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.

URL http://schemas.openxmlformats.org/drawingml/2006/main

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` `003b65a3d89623a26cb536f681aebc8f4a576e9ea7eaa39f6299b5cfa745d173`	ole-package	OLE Ole10Native stream: MBD015A74FE/OlE10NAtIVE	1175 bytes

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