Office (OLE) / .XLS malware analysis — malicious · 060480d7adc8b58a

MALICIOUS

Office (OLE) / .XLS

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

MD5: 1b5453c60b5ae89fe5b20ffea4718311 SHA-1: 85ab74824975b2679f4877db9100c3903bc8f2b5 SHA-256: 060480d7adc8b58a0519b24cfd009801b52c1f9949949b2942a9238eca187066

228 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1140 Deobfuscate/Decode Files or Information T1204.002 Malicious File

The VBA macro uses WScript.Shell and CreateObject to write a Base64 encoded string, extracted from the document's 'Final Offer' sheet, to a temporary executable file named 'nvidiax.exe'. The script then attempts to decode this Base64 string, likely to execute a second-stage payload. The presence of Shell() and WScript.Shell usage strongly indicates malicious intent.

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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