Office (OLE) / .XLS malware analysis — malicious · e8694b355761c1af

MALICIOUS

Office (OLE) / .XLS

32.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-08-02

MD5: a401dd62e3e12506795e1c2b34aba2e4 SHA-1: 5fb71ea48b9160dff9a9af456fc7bc5e80726804 SHA-256: e8694b355761c1afe58e2dd35c63bd31a90adb369f2692a1a37cee5bb7a0b209

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The critical OLE_VBA_CELL_GETOBJECT_EXEC heuristic indicates that the VBA code is designed to instantiate and execute content from worksheet cells. The script further confirms this by constructing a batch file path 'C:\Users\<username>\oMbKG.bat' and writing a string to it. This batch file is then opened using GetObject, suggesting it will be executed to download and run a secondary payload. The presence of WScript references and CreateObject/GetObject calls further supports this malicious intent.

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` `c3e407d33201d4aed6343f02bec79a891cc82f3ee9e7746c6a1039c0c2dbbb29`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1680 bytes

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