Office (OLE) / .XLS malware analysis — malicious · d8f978696711a048

MALICIOUS

Office (OLE) / .XLS

32.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-08-03

MD5: 144a6de371194d4c15cd9dfd2c8f7015 SHA-1: e4b39e8f0e92618655990c8ddcad20e8754f775a SHA-256: d8f978696711a048068cfcae0b8efa9adb26eba4d449819d7893d6a7cedca64c

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 executing content from worksheet cells. The VBA script constructs a batch file named 'oMbKG.bat' in the user's home directory and then uses GetObject to open and execute it. This strongly suggests the macro's purpose is 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` `c3e407d33201d4aed6343f02bec79a891cc82f3ee9e7746c6a1039c0c2dbbb29`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1680 bytes

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