Emotet Office (OLE) / .XLSX malware analysis — malicious · 4d9a8e1a8144e5b3

MALICIOUS

Office (OLE) / .XLSX

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

MD5: 963b6a6850071af003ebdb1611a38dac SHA-1: 8900c45d7876c45478d032b9b24b5017391dc4ca SHA-256: 4d9a8e1a8144e5b368f586b4ae6602f0132ba3c65645ff7a07c46820f50bbab2

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, specifically a Workbook_Open auto-execution, strongly indicate a malicious document. The VBA script contains obfuscated commands that reconstruct the following URLs: 'http://midnighsilverbcraft.com/store/wBjNOUw/B710N4cA6R3/', 'http://temp.com/NAT_05_22_2009/BI710N4cA6R3/', and 'https://redington.karmart'. These URLs are used to download and execute secondary payloads, evidenced by the presence of commands like 'c:\programdata\oue4hjld.vbs' and 'c:\programdata\bhnasleil.bat'. The script's intent is to download and execute a second-stage payload from these embedded URLs.

Heuristics 6

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

ClamAV detected this file as malware: Doc.Downloader.EmotetRed02220-9938909-0
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` `001a648e78328c74323fd376d780f301d1782dbbf63b1f3351a614bfa9d5fb12`	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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