Office (OLE) / .XLSX malware analysis — malicious · 0f995146644bdb5e

MALICIOUS

Office (OLE) / .XLSX

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

MD5: c24def31afb0f7f5a74fe80fb58cb2b5 SHA-1: 15af79f8a92f7cd23cceb869171f72a7beb938c4 SHA-256: 0f995146644bdb5e4c4c7159fdb8e270a7928439d42b29d6a66fcf99b00e1754

228 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059.003 Windows Command Shell T1140 Deobfuscate or Obfuscate Malicious Code

The VBA script utilizes WScript.Shell and CreateObject to construct and write a Base64 encoded string to a temporary executable file named 'nvidiax.exe'. This executable is then likely intended to be run, indicating a downloader or dropper functionality. The script's obfuscation and use of shell commands are characteristic of malware delivery mechanisms.

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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