Emotet Office (OLE) / .XLSX malware analysis — malicious · ffe9d5bb2d87af35

MALICIOUS

Office (OLE) / .XLSX

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

MD5: c647067b060e957021cfb86e67850bc6 SHA-1: bb65844ed1ce6bce481ea564db316f2fa27296e9 SHA-256: ffe9d5bb2d87af35d203b915dfef914949f913f75793c23a067298ddc4347b7b

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1059.005 Visual Basic

The sample contains VBA macros that are automatically executed upon opening the workbook, as indicated by the Workbook_Open and OLE_VBA_PCODE_AUTOEXEC_EXEC heuristics. The script leverages `Wscript.Shell` to execute a batch file located at `c:\programdata\jledshf.bat`. This batch file, in turn, appears to download and execute further payloads from a list of obfuscated URLs, including `http://aixyana.com/wp-admin/6pY001tdOxY1b10/` and `https://ncikjeja.com/bacc/lO46QUEiVanm/`. The ClamAV detection name further supports the Emotet family attribution.

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` `c49f2df77c50e10269216d97c3efdf7c32f9f18ba5d8fd42a9b144f48e100040`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	5709 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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