Office (OLE) / .XLS malware analysis — malicious · 9c5e9e59b3e97102

MALICIOUS

Office (OLE) / .XLS

168.0 KB Created: 2021-04-13 13:37:17 Authoring application: Microsoft Excel

MD5: db36d6a0613d53ab149bcef0eab64476 SHA-1: 2b00d4f8a1af3c2fb604a29056b836a31d35f9cf SHA-256: 9c5e9e59b3e97102933a3791a0b43e0e309237e0a70995ee5a5d9e5ccbe9e1b2

140 Risk Score

Malware Insights

MITRE ATT&CK

T1059.005 Visual Basic T1204.002 Malicious File T1059.003 Windows Command Shell

The Workbook_Open macro executes a PowerShell command that downloads a second-stage executable from 'http://3.64.251.139/v11/1/TDH_0082205005IMG.exe' and saves it as 'C:\Users\Public\Documents\allowaway.exe'. The macro also writes this command to a file named 'C:\Users\Public\Documents\newago.cm' and then uses GetObject to execute the command from that file. This indicates a downloader pattern.

Heuristics 4

Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
GetObject call high OLE_VBA_GETOBJ

GetObject call
VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC

Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
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` `b13c36b7b5fb03471bf69bd85732b245d590dd207d1b5eb03ce83d7dcb7419b7`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	1335 bytes

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