Office (OLE) / .XLSX malware analysis — malicious · 9cbbea3dc408ebb5

MALICIOUS

Office (OLE) / .XLSX

399.5 KB Created: 2016-11-08 08:33:09 Authoring application: Microsoft Excel First seen: 2022-08-01

MD5: 5ff85f62cac01c691496dc6ce919853c SHA-1: d778169a7b514cadf2bd65f94543ab0573a79be5 SHA-256: 9cbbea3dc408ebb5d037f1c904f5445c2e7b71ebfa50d4897b57222bb86a3426

228 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1140 Deobfuscate/Decode Files or Information

The VBA macro uses WScript.Shell to create and write a Base64 encoded payload to a temporary executable file named 'nvidiax.exe' in the user's temporary directory. It then attempts to establish persistence by writing an entry to the Run key: HKCU\Software\Microsoft\Windows\CurrentVersion\Run\IAccessible2Proxy. The document body, presented as a financial offer, likely serves as a lure to encourage the user to enable macros, thereby triggering the malicious script.

Heuristics 6

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
WScript.Shell usage critical OLE_VBA_WSCRIPT

WScript.Shell usage
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Environ() call (env variable access) low OLE_VBA_ENVIRON

Environ() call (env variable access)

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `54ba713ab254cfd6176a4b8846c3b0962e2e7a2f34b5c1107ba20bf283bf1595`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	7094 bytes

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