Emotet Office (OLE) / .XLSX malware analysis — malicious · ff84132ed69fbe1a

MALICIOUS

Office (OLE) / .XLSX

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

MD5: a2da35c3a7648eca161e39347995992b SHA-1: 4f981c71419586452c5f41d78f106a651ac0c21a SHA-256: ff84132ed69fbe1ae17996955ec5ef61a02fba78911839b2fd92817eb5ee4e88

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic for Applications T1059.003 Windows Command Shell T1105 Ingress Tool Transfer

The file contains VBA macros that execute upon opening, as indicated by the Workbook_Open heuristic. The script attempts to create a Wscript.Shell object to execute a batch file located at 'c:\programdata\jledshf.bat'. The embedded script also contains obfuscated URLs that are likely used to download and execute further stages of the malware. 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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