Emotet Office (OLE) / .XLSX malware analysis — malicious · c9f578482a8dddf1

MALICIOUS

Office (OLE) / .XLSX

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

MD5: f4ebd45446280caccecd3adb65aaec55 SHA-1: 4b9b544fa758dac4512197f1440735e313e1d8e5 SHA-256: c9f578482a8dddf16ba7c9618526b03b6bc58bc4ae8795874a546b1e9f0b570b

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The file contains a Workbook_Open macro that uses CreateObject to interact with Wscript.Shell, indicating an attempt to execute commands. The macro constructs a batch file (`c:\programdata\uidpjewl.bat`) which, in turn, attempts to download and execute payloads from multiple URLs. The ClamAV detection and heuristic firings strongly suggest this is an Emotet downloader variant. The script's intent is to download and execute a second-stage payload from the reconstructed URLs.

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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