Office (OLE) / .XLS malware analysis — malicious · 043a034fc7bc6d03

MALICIOUS

Office (OLE) / .XLS

683.5 KB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-06

MD5: a009e0ab7c991a2f728da763d6c2a57e SHA-1: 823ae45d1b02b640168a7eb85dfbd59910d6cd34 SHA-256: 043a034fc7bc6d03018a97823745a0898307d951a08e94c171778569db5b2be2

148 Risk Score

Malware Insights

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1204.002 User Execution: 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 this exploit payload strongly suggests the document is designed to leverage this vulnerability upon opening. While no VBA macros were found to be executable, the embedded OLE object itself serves as the exploit vector.

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` `382fc1344a2f0cf6eda18645d41def8d571debc6637bc7fe02a5c83715a51bef`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2112 bytes
`ole10native_00.bin` `b3dda004fcc07fcec0e9f48306b3a79cfc3c81d9bd33aa9869d3f155547f049e`	ole-package	OLE Ole10Native stream: MBD0108420F/oLe10nATiVE	1637 bytes

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