Office (OLE) / .XLS malware analysis — malicious · 3650c83665295935

MALICIOUS

Office (OLE) / .XLS

1004.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-22

MD5: fbdc5be1db251281b8fdb338ffe5a0aa SHA-1: cd876163bacf12c676efa0a58c51b8ba40c93c0a SHA-256: 3650c836652959350c832c3f1a583f50f493c369a3104f71e9648082765d658e

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 the Equation Editor OLE object. This is a common method for delivering malicious payloads via specially crafted Office documents. The presence of VBA macros, though not executable, further supports the malicious nature of the file.

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 EBP) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EBP)
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` `1d3b71b8c6234aace88f31f6e674b07383e015a2e68993dcd4fc2526aa470fe5`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2412 bytes
`ole10native_00.bin` `b16cb162a7e0b78cddd7baf786e776976e288d8ced7762a9ed1e03b545e0a225`	ole-package	OLE Ole10Native stream: MBD0234126A/oLE10nAtIVE	1604 bytes

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