Emotet Office (OLE) / .XLSX malware analysis — malicious · b63f4ee07b1eedff

MALICIOUS

Office (OLE) / .XLSX

122.5 KB Created: 2022-02-09 09:48:26 Authoring application: Microsoft Excel

MD5: 8ca9866f4f6faf153740f94956066e49 SHA-1: 835823d532ea15055eff15203e400a5b2058988b SHA-256: b63f4ee07b1eedff5aa07012baece18e444191d3adadd61e109174b7fc91fba9

240 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.001 PowerShell T1204.002 Malicious File T1105 Ingress Tool Transfer

The critical ClamAV detection and high-severity heuristics for VBA macros, Workbook_Open execution, and CreateObject calls strongly indicate a malicious macro-based document. The VBA script within 'macros.bas' is designed to execute a series of commands, including the creation of a VBS file ('oue4hjld.vbs') and a batch file ('bhnasleil.bat') in the 'c:\programdata' directory. The script also attempts to download a payload from multiple URLs, including 'http://midnighsilverbcraft.com/store/wBjNOUwc/NATE_05_22_2009/BI710N4cQA6R3/', 'http://temp.com/NATE_05_22_2009/BI710N4cQA6R3/', and 'https://redington.karmaat', which is characteristic of Emotet's downloader functionality.

Heuristics 6

ClamAV: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Xls.Downloader.Emotet-ab81c42b2bd4747e-9951196-0
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` `56adc17a1b454a6e0d6fef7d69e90a303bfefbc483a4cccdbace4bfa7a007e53`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	52433 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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