Office (OLE) / .XLS malware analysis — malicious · 9974c94540639259

MALICIOUS

Office (OLE) / .XLS

32.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-08-06

MD5: 923b393d7738d5c824a4da64abd6007e SHA-1: 9446fcfd725c935e80f0312aa9a2dfdd0239515e SHA-256: 9974c9454063925957f3353990334261dcedd5372c664c4a2e49b478b3a22c6a

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 VBA code is instantiating and executing content from worksheet cells. The VBA macro `JZJdn` constructs a batch file named 'rSunt.bat' in the user's profile directory. It then uses `GetObject` to open this batch file, which likely contains commands to download and execute a second-stage payload. The `CreateObject("WScript.Network")` call and the `GetObject` function further support the execution of external scripts.

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` `0ca698d536659da9050ffea082302597604c06bba3a4415116d6fc6b4fde6bfd`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1680 bytes

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