Emotet Office (OLE) / .XLSX malware analysis — malicious · f4cba7c6b7f72a6f

MALICIOUS

Office (OLE) / .XLSX

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

MD5: cdc2d384c738807edd8198d0b47d535c SHA-1: ec5bcda5224efc80a9bd343263a11e1d0f4e9607 SHA-256: f4cba7c6b7f72a6f3e39b1e874f4237cd11056913aa4ab9f180ec60aa9447988

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1566.002 Spearphishing Attachment T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

This XLSX file contains a Workbook_Open VBA macro, a common delivery mechanism for Emotet. The macro displays a deceptive message box to the user and then proceeds to execute a batch file located at 'c:\programdata\uidpjewl.bat'. The batch file contains obfuscated commands that appear to download and execute further payloads from multiple URLs. The ClamAV detection also strongly suggests Emotet. The VBA macro's primary function is to initiate the execution chain, likely for downloading and running a second-stage payload.

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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