Office (OLE) / .XLS malware analysis — malicious · 581e4996f8307c18

MALICIOUS

Office (OLE) / .XLS

32.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-07-14

MD5: 7cc82d6f7aa19a1bf6cb6a8e46e8ca53 SHA-1: ac881a3eb0645a79c21c72c73f1bd566cd37f84a SHA-256: 581e4996f8307c18bd566bb3696d9ed586b9d5556d63667d22d049d8a0058e5d

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

The critical heuristic OLE_VBA_CELL_GETOBJECT_EXEC indicates that the VBA macros instantiate and execute content from worksheet cells. The Workbook_Change event triggers the execution of a function that constructs a batch file named 'tBvhN.bat' in the user's profile directory. This batch file is then opened using GetObject, suggesting it will be executed, likely to download and run a secondary payload. The script also uses CreateObject("WScript.Network") and GetObject calls, further supporting the execution of external commands.

Heuristics 5

VBA instantiates/executes content from worksheet cells critical OLE_VBA_CELL_GETOBJECT_EXEC

VBA passes a worksheet cell/comment reference to GetObject and drives an Exec/Open/Run sink. Malware hides the COM moniker and command in cell data so the macro source carries no literal indicators.
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
GetObject call high OLE_VBA_GETOBJ

GetObject call
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `216ec87e887b53424f0e74f34e7d6371b399bebbfce8a474218fd02013a28585`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1680 bytes

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