Office (OLE) / .XLS malware analysis — malicious · 4676391c499fce0c

MALICIOUS

Office (OLE) / .XLS

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

MD5: 4a1cd0f8d3f41a8fe750f8b58828321a SHA-1: a2257bf178eeb05ab0cb0d705555d8af0b35f78a SHA-256: 4676391c499fce0c767937895167f8467a4b5cc6464e7130b61b0edc59da9163

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 VBA script constructs a batch file path 'C:\Users\<username>\tBvhN.bat' and writes obfuscated content to it, which is then opened by a GetObject call. This suggests the macro is designed to download and execute a second-stage payload.

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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