Emotet Office (OLE) / .XLSX malware analysis — malicious · f7f3aec0da9a2160

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 55e24144561b00eeee434ff30c7f01a8 SHA-1: 397344a0a5bda787ffb4f33bbf04658ea22c7f56 SHA-256: f7f3aec0da9a21605b4580ddd1105fdd9218bd69d34a7ec5d0013d09079b8153

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

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

The sample is identified as malicious by ClamAV with the signature 'Doc.Downloader.EmotetRed02220-9938909-0'. The Workbook_Open VBA macro automatically executes upon opening the document. It utilizes Wscript.Shell to run two embedded commands: first, it executes 'c:\programdata\yhjlswle.vbs', and second, it executes 'c:\programdata\ughldskbhn.bat'. The VBA code reconstructs the command 'c:\programdata\ughldskbhn.bat' and also attempts to run 'wghwuyscghwuyrghwuyipghwuyt ghwuycghwuy:ghwuy\pghwuyroghwuygraghwuymdghwuyatghwuya\yhjlswle.vghwuybghwuys', which appears to be an obfuscated attempt to execute the .vbs file. This indicates the macro's primary function is to download and execute a second-stage payload.

Heuristics 7

ClamAV: Doc.Downloader.EmotetRed02220-9938909-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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` `7a075e02dc1e88807280b9b84946715e79a3c091d50391301434649c77b78ea1`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	12808 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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