Office (OLE) / .XLS malware analysis — malicious · 7552326de3a85dff

MALICIOUS

Office (OLE) / .XLS

32.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-07-16

MD5: acf489e91e37d8b90ae41eee1f26308c SHA-1: 01de3b0597531bd292c0dd917bcc61d0d4b82f74 SHA-256: 7552326de3a85dff87eb8f64856e15a3f2d462dd65b12df5e4c80909fed60c65

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1218.011 System Binary Proxy Execution: Rundll32 T1059.003 Windows Command Shell

The sample is a macro-enabled Excel file that uses VBA to execute code. The critical heuristic 'OLE_VBA_CELL_GETOBJECT_EXEC' indicates that the VBA code instantiates and executes content from worksheet cells. The script attempts to create a batch file named 'sGkBx.bat' in the user's profile directory and then opens it using GetObject, likely to download and execute a second-stage payload. The use of CreateObject("WScript.Network") and GetObject suggests interaction with Windows Script Host for execution.

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` `c5bddb7670b6ba135625deae6aaf612489feea49e8ff308f24d9f46be317b525`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1680 bytes

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