Office (OLE) / .XLS malware analysis — malicious · 686704b95d8594a7

MALICIOUS

Office (OLE) / .XLS

60.0 KB Created: 2023-03-08 12:38:52 First seen: 2023-03-09

MD5: cf3befbe8ddfcdc3e9a35f39c15a77cc SHA-1: c4544ea123bcb49788b0c0ecdf7f72d90d779109 SHA-256: 686704b95d8594a70d0305b7702d3518120ef4088795380847a48e313d017b4a

288 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1105 Ingress Tool Transfer T1204.002 Malicious File

The VBA macro utilizes WScript.Shell and CreateObject to download a file from the constructed URL 'http://internetrasporti.com' and save it locally as a '.cvs' file. This indicates a downloader functionality, aiming to fetch and execute a secondary payload. The use of Shell() and WScript.Shell points towards execution of arbitrary code.

Heuristics 7

Shell() call in VBA critical OLE_VBA_SHELL

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

WScript.Shell usage
VBA downloads and writes a file to disk critical OLE_VBA_HTTP_DROP_EXEC

VBA reads an HTTP response body and writes it to disk (ADODB.Stream SaveToFile). Combined with the auto-exec/Shell paths this is a download-drop dropper even when the COM ProgIDs are built dynamically to evade keyword scanning.
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` `f9af03831255df4fba629ffe6be4f041d6ac552aa713623ed6cf8c7f37e685e4`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	2188 bytes

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