Emotet Office (OLE) / .XLSX malware analysis — malicious · 345d775c2983de87

MALICIOUS

Office (OLE) / .XLSX

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

MD5: a0cfcac5b7df2fda2b35b7f557e6d4dd SHA-1: 0336435705b562c0be60c564e67389b01f98d991 SHA-256: 345d775c2983de8793019f9bce7892a17286a64dbe940a80c8566a201a09b87c

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The file is detected as Emotet by ClamAV and contains VBA macros that trigger on workbook open. The Workbook_Open subroutine utilizes CreateObject to execute Windows Script Host, which in turn is likely to run a malicious VBScript or batch file. The DOC BODY contains obfuscated commands that reconstruct multiple URLs, suggesting a downloader functionality. The reconstructed URLs are: "http://youlanda.org/eln-image/n8DPZISf/ ,http://roseveideo.net/eln-images/EjdcOMlY8Gy/,http://vbaint.com/eln-images/H2pPGtE8XzENc/,http://framemaker.us/eln-images/U5W2IGE9m8i9hr/,http://nipalaw.com/asolidfouadation,http://robtermchilesp.com/cgi/3f/,http://vocoptions.net/cgi/ifM9R5ylbVpM8hfr/,http://misionnyn.org/fonts/JO5/,http://robterflod.us/eln-images/DGI2YOkwS9XPO/,http://mpmcomputing.com". These URLs are likely used to download and execute a second-stage payload. The presence of `c:\programdata\tjspowj.vbs` and `c:\programdata\uidpjewl.bat` further indicates the execution of malicious scripts.

Heuristics 7

ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
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` `faf50200d5a9adeeda00cc1da1bbf8f6abf0317a1e97a58db8ae804ba12ba446`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	13985 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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