Emotet Office (OOXML) / .XLSX malware analysis — malicious · ca2b2bcc176d4e95

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 509b2c16436e5c161355b2865156b88b SHA-1: ddeacef40fe4d68f259aa01396e257390542ea3b SHA-256: ca2b2bcc176d4e959f18b04d91c6c4860b5bc03b67261fbbfbcd219365bd298c

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Service Execution T1059.003 Command and Scripting Interpreter: Windows Command Shell T1566.002 Phishing: Spearphishing Attachment

The file is identified as malicious by ClamAV and contains a Workbook_Open macro, a common Emotet technique. The macro attempts to execute a batch file and a VBScript. The VBScript appears to be a downloader, constructing a URL from concatenated strings: "http://sumedahonline.com/wp-content/HyzNXJ30XQEVcBS RH/ ,http://divachintex.com/wp-incluedes/WWhWRKs8KvzNFm6/,http://hotelalandmalaabol.com/1520/bUdhEPdf/ ,http://shwenantawin.com/copma/XTnZJii02vfg". This script likely downloads and executes a second-stage payload.

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` `8a5beb393b02a3c3dd8a9d79b7f0abd68b14cae92c1c00175355a0cf3758b9b4`	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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