Office (OLE) / .XLS malware analysis — malicious · 56c743180f8459c0

MALICIOUS

Office (OLE) / .XLS

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

MD5: 053dbb0cbcfcb2f96552414b4637a0ac SHA-1: 5f8ba5947e41eaf20cbb4cb7e8ac69e140d56b3a SHA-256: 56c743180f8459c00a5941dc3fca9c254cce1ea8830c84a617c3e33fbcd30650

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File T1059.005 Visual Basic

The critical heuristic OLE_VBA_CELL_GETOBJECT_EXEC indicates that the VBA macros instantiate and execute content from worksheet cells. The Worksheet_Change event handler constructs a string from various cell values and writes it to a batch file named 'JWCbi.bat' in the user's profile directory. It then uses GetObject to open this batch file, likely to execute it.

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` `0959ceb070c14f48d6f3ae1c29b9e93ecb94cac1ebd05153fba2bba80af01703`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1680 bytes

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