Office (OLE) / .XLS malware analysis — malicious · 1c9d963f1aafaad9

MALICIOUS

Office (OLE) / .XLS

229.0 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel First seen: 2022-08-25

MD5: 0eb60354f0401f2a56f5f3a8e15d6147 SHA-1: 58271ee15c52baba9018c8a7fcfbb762574cfe22 SHA-256: 1c9d963f1aafaad9d6ee7c092c6bd77bda5d1590c125238cb0671fcf176d078a

128 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment

The sample is an Excel file containing VBA macros that, when enabled, create and execute a batch file named 'dfuuE.bat' in the user's profile directory. The batch file contains obfuscated commands, likely for downloading and executing a second-stage payload. The 'SE_INVOICE_LURE' heuristic and the document body text suggest a social engineering tactic using a fake invoice to prompt macro execution.

Heuristics 4

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.
GetObject call high OLE_VBA_GETOBJ

GetObject call
VBA macros detected medium OLE_VBA_MACROS

Document contains VBA macro code
Fake invoice / payment lure low SE_INVOICE_LURE

Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators

Extracted artifacts 1

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `ae90e9b865026aba5be8261caf4c224c6f1fddd354a073e6cb857a51cb0c4a01`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1894 bytes

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