Office (OLE) / .XLS malware analysis — malicious · ab46ca1c7d41b9f8

MALICIOUS

Office (OLE) / .XLS

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

MD5: 3afd276cbdc1f594a10af709194b1090 SHA-1: cd16c6d48085547a2ac2dcd6839806b3c14f7c7e SHA-256: ab46ca1c7d41b9f8de60fd17683818a28c880ee879f06da775f172777bf07228

200 Risk Score

Malware Insights

MITRE ATT&CK

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

The sample contains VBA macros that leverage `GetObject` and `CreateObject` to instantiate Windows Script Host and execute commands. Specifically, it constructs a batch file named 'eUOKm.bat' in the user's profile directory. The content of this batch file is assembled from worksheet cells, including a Base64 encoded string that decodes to 'Windows Style Sheet hidden XEI Text:System.Text.Encoding::FromBase64String(46SgnirtS)' and a command to start this script. This indicates a downloader or initial execution stage for a more complex attack.

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` `dbe842917e3187a3520123540c41f291f817f6badf4f4a15bb6cf341802bc084`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1680 bytes

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