Office (OLE) / .XLS malware analysis — malicious · 05c51ee50d11f9cd

MALICIOUS

Office (OLE) / .XLS

53.0 KB Created: 2023-02-15 08:45:23 First seen: 2023-02-22

MD5: a93c4bf752cf9a2a030df4064a963e8e SHA-1: 624b96b5e132089a222973b897b7589626e69d8d SHA-256: 05c51ee50d11f9cdc613c88fe92ea2b20d1ad2ada394a4104f4f962b47335514

348 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1105 Ingress Tool Transfer T1059.003 Windows Command Shell

The VBA script utilizes WScript.Shell and CreateObject to call the URLDownloadToFileA function, indicating an attempt to download and execute a secondary payload. The presence of these critical heuristics strongly suggests a downloader or droppper functionality. The script's obfuscation and truncation prevent a more detailed analysis of the specific payload or download URL.

Heuristics 8

Reference to URLDownloadToFile API critical SC_STR_URLDOWNLOAD

Reference to URLDownloadToFile API
Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
URLDownloadToFile in VBA critical OLE_VBA_DOWNLOAD

URLDownloadToFile in VBA
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` `d6429f4a0c62b10763c3e89ca88b73da19c5bbedd4e895c4667f182d20715035`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2516 bytes

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