Emotet Office (OLE) / .XLS malware analysis — malicious · c03859f634a8fe4e

MALICIOUS

Office (OLE) / .XLS

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

MD5: 3f51b27c57331dd45b1d5a3b94772201 SHA-1: 6d79f965eeab4c3327a5149b668f202393bdb928 SHA-256: c03859f634a8fe4e5c82c661b26ef42e7a98509f245f8e45db542c5b0437c21b

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample is identified as malicious by ClamAV and exhibits high-severity heuristics for VBA macros, including Workbook_Open auto-execution and CreateObject calls. The embedded VBA script, specifically the Workbook_Open subroutine, is designed to execute a batch file located at 'c:\programdata\jledshf.bat'. This batch file, in turn, uses 'wscript.shell' to download and execute payloads from multiple URLs, including 'http://activatedes.laforetlangages.com/wp-admn/BlkdOXjLX/'. The script also attempts to reconstruct a complex PowerShell command using base64 encoded strings, which likely serves to download and execute further stages of the malware.

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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