Emotet Office (OLE) / .XLSX malware analysis — malicious · 1f6168dee8108137

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 994898b6f2ac9cb3d172f7b9b377e0ba SHA-1: 7a8128bac2e592445ec9bd69a5e302d23ea1bc91 SHA-256: 1f6168dee8108137d5fa575f2ea934a16eb81b1214ef0ca3bb92c3d7901b086d

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Service Execution: Visual Basic T1059.003 Command and Scripting Interpreter: Windows Command Shell T1204.002 Malicious Link: Malicious File T1566.001 Phishing: Spearphishing Attachment

The file is a macro-enabled Excel spreadsheet identified as malicious by ClamAV, specifically as an Emotet downloader. The Workbook_Open macro executes a Windows Script Host (Wscript.Shell) object, which is used to create and execute a batch file. This batch file contains obfuscated commands that appear to download and execute payloads from multiple URLs. The VBA script also contains a MsgBox that attempts to trick the user into running the malicious code.

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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