Office (OOXML) / .XLSM malware analysis — malicious · 8ceae17c6a9fec00

MALICIOUS

Office (OOXML) / .XLSM

22.7 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300

MD5: dcc165863b274e869ea3fcad7499b793 SHA-1: fb38b9c991744087932066e5e6ba9ea5377030cf SHA-256: 8ceae17c6a9fec00be0b94843b44fd2b19909cc080fcaa3a29a994f98ee6bc3a

100 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1204.002 Malicious File

The sample is an XLSM file containing VBA macros. A critical heuristic indicates a Shell() call within the VBA, and a medium heuristic flags a macro-enable lure. The VBA script decodes a Base64 string which, when decoded, reveals a PowerShell command. This command downloads a file named 'msn.exe' from 'http://84.252.122.203/acsa/msn.exe' and saves it as '%APPDATA%\ProcName', then executes it. The script also reconstructs the path to PowerShell: 'C:\Windows\System\WindowsPowerShell\v1.0\powershell.exe'.

Heuristics 3

Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `e31276cb4d2a5967e4443e4b524f086bf6bcff13aadf8dc27874baa7a07f8973`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	2583 bytes
`vbaProject_00.bin` `3518361d303b1c042177259693370acdb7c76bc351bf4a57a7e22c43380aea00`	vba-project	OOXML VBA project: xl/vbaProject.bin	6144 bytes

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