Office (OLE) / .XLS malware analysis — malicious · c3c3a51ce1463dd5

MALICIOUS

Office (OLE) / .XLS

392.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2022-11-03

MD5: 5da2444e6122121634917f7fc5b74c52 SHA-1: dbed04f55b57a9ea469da017902439655a6b6379 SHA-256: c3c3a51ce1463dd511b92bc2406f52539b4bebe1c6ad4e6812ed558b1f5c596b

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. This is further supported by the OLE_EQUATION_EDITOR heuristic. The VBA macros themselves do not contain executable statements, suggesting the exploit payload 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 EAX) high SC_GETPC_CALL

x86 GetPC stub (CALL $+5; POP EAX)
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` `434f40c2cd03d471bffbfe151ab3dfffb02b43b314ba9611623ae266b5acfe73`	ole-package	OLE Ole10Native stream: MBD0048276B/OlE10naTiVE	1145 bytes

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