Office (OLE) / .XLS malware analysis — malicious · d66e651f7c924f1f

MALICIOUS

Office (OLE) / .XLS

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

MD5: b59b98cd49ba108dacb32b38349f8b40 SHA-1: 4bfd485745cda686ae14e601b36dd9aeadd5916f SHA-256: d66e651f7c924f1f7cc5b055f9850564987d1925abfed5dda9e6074d5b604f50

228 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1059 Command and Scripting Interpreter T1140 Deobfuscate or Obfuscate T1204.002 Malicious File

The sample is an Excel file containing VBA macros that leverage `WScript.Shell` and `CreateObject` to execute shell commands. The macro decodes a Base64 string from the spreadsheet and saves it as `nvidiax.exe` in the user's temporary directory, likely to download and execute a second-stage payload. The document body's Persian text appears to be a form for providing personal information, suggesting a phishing or data collection lure.

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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