Emotet Office (OLE) / .XLSX malware analysis — malicious · e768aefa1b44781b

MALICIOUS

Office (OLE) / .XLSX

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

MD5: cc36af78bb9383ad0fe4781ae74f0adb SHA-1: b6b14071901728be4125751baa87a5a163af9e0d SHA-256: e768aefa1b44781bc30d4cc52e1a116cdb33391be88d65b1a59d248f601ee696

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1566.001 Spearphishing Attachment 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 utilizes Wscript.Shell to execute a batch file located at 'c:\programdata\jledshf.bat'. The embedded URL 'http://aiqyana.com/wp-admin/6pY01tdOxY1b10/' is likely used to download a second-stage payload. The ClamAV detection and heuristic firings strongly suggest this is an Emotet downloader.

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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