Emotet Office (OLE) / .XLSX malware analysis — malicious · e845667dce2e7e36

MALICIOUS

Office (OLE) / .XLSX

88.5 KB Created: 2022-02-14 05:58:53 Authoring application: Microsoft Excel First seen: 2022-02-22

MD5: 28ddfa22b3d141fbccf77afbd9afb4fb SHA-1: 2a1cf80bbb57685b4b799e97eafbcf1ea6c04cf5 SHA-256: e845667dce2e7e36598e1fa36f9baf08125f73112a6495e784ccdb3e1c677dd7

280 Risk Score

Malware Insights

Emotet · confidence 95%

MITRE ATT&CK

T1059.005 Visual Basic T1059.003 Windows Command Shell T1204.002 Malicious File

This XLSX file contains VBA macros, including a Workbook_Open auto-execution routine, which is a common delivery mechanism for Emotet. The script attempts to download and execute a VBScript payload from the reconstructed URL 'http://www.ama.com/download/Fouiwx-CNOJDxhsdhjbouhuiwtuiwp:dhjdhj0omauiwrt.cuiwo.iuiwndhjinfuiwructuosedhjm4mgt2MeUdhjbouhuiwtuiwp:dhjdhjmuiwctc.juiwoburg.ouiwrg.uiwzadhj-dhjGBGJeFxXWlNbABv2dhjbouhuiwtuiwp:dhjdhjwuiwwuiww.auiwma.cuiwudhjjprdhjVVPdhjbouhuiwtuiwp:dhjdhjactuiwividades.laforetlan+uiwguages.couiwmdhjwpuiw-aduiwmindhjdU8Dsdhjbouhuiwtuiwps:dhjdhjdwuiwwmaster.cuiwomdhjwuiwp-couiwntentdhj1sR2HfFxQnkWuudhjbouhuiwtuiwps:dhjdhjeduiwu-meuiwdia.cndhjwuiwp-admuiwindhj0JAEdhjbouhuiwtuiwpuiws:dhjdhjiacademyuiwgruiwoup.cldhjofuiwficedhjG42LJPLkldhjbouhuiwtuiwps:dhjdhjznzhuiwou.tuiwopdhjmuiwodedhj0Qbdhj\'. The VBScript is then executed using 'wscript c:\programdata\bbiwjdf.vbs'.

Heuristics 7

ClamAV: Doc.Downloader.Emotet02220-9940037-0 critical CLAMAV_DETECTION

ClamAV detected this file as malware: Doc.Downloader.Emotet02220-9940037-0
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` `98ce64e756a4ee3d4f776c1541f7f3ad0f966d786db88eda74f9a833f3a74b83`	vba-macro	oletools.olevba.extract_macros (decoded VBA source)	11705 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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