Emotet Office (OOXML) / .XLSX malware analysis — malicious · 40450d9b6d858d22

MALICIOUS

Office (OOXML) / .XLSX

115.1 KB Created: 2015-06-05 18:17:20 UTC Authoring application: Microsoft Excel 12.0000

MD5: 270d8215be995e6dbba1e720ecb21d6a SHA-1: c3932fec3d3f6b312061ee02e2e0ba76c64b5948 SHA-256: 40450d9b6d858d220a3db8fc3d9665b3b0dbbc4c08752e69751ab252aa3c603a

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1059.005 Visual Basic T1204.002 Malicious File

The file is identified as malicious by ClamAV with a signature indicating it is an Emotet downloader. The presence of a Workbook_Open macro and CreateObject calls suggests malicious VBA code execution. The obfuscated PowerShell command within the DOC BODY reconstructs to a series of URLs that likely host the second-stage payload, and also specifies the creation of two files: 'c:\programdata\jledshf.bat' and 'c:\programdata\tghklsd.vbs'. The VBA macro itself appears to be designed to obfuscate its actions, but the overall intent is to download and execute a payload.

Heuristics 5

ClamAV: Xls.Downloader.EmotetExcel02223-9938902-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.EmotetExcel02223-9938902-0
Workbook_Open macro high OLE_VBA_WBOPEN

Workbook_Open macro
CreateObject call high OLE_VBA_CREATEOBJ

CreateObject call
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 project inside OOXML medium OOXML_VBA

Document contains vbaProject.bin — VBA macros present

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas` `df1eb14c222394595c0518b49eec2b55ed9573146c5f1717dedceddd2e199a2b`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	12041 bytes
Detection ClamAV: No threats found Obfuscation or payload: likely Carved macro source contains an auto-exec entry point and execution/download terms.
`vbaProject_00.bin` `b2d41c75f023e49f4ad1b48cb718e82ed9730ec08694aa1b9767dd4e2a12dc70`	vba-project	OOXML VBA project: xl/vbaProject.bin	42496 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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