Office (OLE) / .XLS malware analysis — malicious · 8d6184a3fe653789

MALICIOUS

Office (OLE) / .XLS

876.0 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-27

MD5: b17aa112ef35142f70c1902fcf2092c7 SHA-1: 2054b623db7039cb645c489e9e906425e38c5f2f SHA-256: 8d6184a3fe653789b8fe9090195fe4e7f308d70168a7092d09f588fe3cf19ffb

148 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 Malicious File

The critical heuristic firing for CVE-2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. The presence of an OLE object containing an Equation Editor payload strongly suggests this attack vector. No VBA macros were found to be executable, but the OLE object itself likely contains the exploit code.

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 ESI) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP ESI)
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` `9484cff836bbb3a1a953aa6fc0a35511ae0354e2d07b816add97c08218ed99fd`	ole-package	OLE Ole10Native stream: MBD01945FC3/olE10NAtiVe	1402 bytes

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