Office (OLE) / .XLS malware analysis — malicious · b5920f6438479a89

MALICIOUS

Office (OLE) / .XLS

1.06 MB Created: 2006-09-16 00:00:00 Authoring application: Microsoft Excel First seen: 2023-02-13

MD5: 5f90478d1b76bf11b949249d69a801e7 SHA-1: 1d89fc258bf68f0676c39fa0735ed9a47f0a14e3 SHA-256: b5920f6438479a8949baa8244dac079aaab3f54f25f2d59234d1163fff01d9da

150 Risk Score

Malware Insights

MITRE ATT&CK

T1203 Exploitation for Client Execution T1059.005 PowerShell

The critical heuristic firing for CVE_2017_11882_EQUATION_OLE10NATIVE indicates the exploitation of a known vulnerability in Microsoft Equation Editor. This suggests the file's primary purpose is to deliver a payload by leveraging this exploit. No VBA macros were found to contain executable statements, and no scripts were extracted.

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 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.
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` `f8b00ca86eb2a08a1eab758c7ee99ed7aaa23eef53aa327de4d17a5c9931cf58`	ole-package	OLE Ole10Native stream: MBD00E76FE3/ole10nAtIVE	1427 bytes

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