Office (OLE) / .XLS malware analysis — malicious · 3cd2459f1d568d4a

MALICIOUS

Office (OLE) / .XLS

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

MD5: d6b1e5a67d3c55b47096c958646db5b8 SHA-1: 29ca3e0db93d99395a893d20ab05185e105ce012 SHA-256: 3cd2459f1d568d4aaaf422c284892810f7cb60dc69af99adb060f84a1c94ece6

200 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample is an Excel file containing obfuscated VBA macros. The critical heuristic 'OLE_VBA_CELL_GETOBJECT_EXEC' indicates that the macros instantiate and execute content from worksheet cells. The script constructs a batch file path 'C:\Users\<username>\fOMzZ.bat' and writes obfuscated content to it, then uses GetObject to open and execute this batch file. 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` `3e9a34f822e477453bd9a32449802989b8eb000f5d2e4e4cbc46c6bfecdb1a5f`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1680 bytes

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