84a9f6e99fa36f2582009e9c4fbec064c314e83052fefc8affc7c31c5a591711

Analysis

max time kernel
109s
max time network
107s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
01/09/2024, 13:39

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General

Target

b1f34545b8b667713d9bf012153ce820N.exe
Size

27KB
MD5

b1f34545b8b667713d9bf012153ce820
SHA1

4ac46156573799927e69cba06bc8f67ff33bd748
SHA256

84a9f6e99fa36f2582009e9c4fbec064c314e83052fefc8affc7c31c5a591711
SHA512

daf6f01abec9a8a5213f743e90cd0a62250e304373daebb3d844db690a7328f19cf88728d03b9706b7b760b632cd8b10b6c082c6457f4e3adc1495ade3a29518
SSDEEP

768:kBT37CPKKdJJ1EXBwzEXBwdcMcI9HxKQ6:CTW7JJ7TKQ6

Score

9^/10

discovery ransomware upx

Malware Config

Signatures

Renames multiple (4572) files with added filename extension
This suggests ransomware activity of encrypting all the files on the system.
ransomware

UPX packed file 4 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral2/memory/1776-0-0x0000000000400000-0x000000000040A000-memory.dmp	upx
behavioral2/files/0x0009000000023419-2.dat	upx
behavioral2/files/0x0014000000022912-6.dat	upx
behavioral2/memory/1776-1009-0x0000000000400000-0x000000000040A000-memory.dmp	upx

Drops file in Program Files directory 64 IoCs

description	ioc	Process
File created	C:\Program Files\Microsoft Office\root\Office16\1033\ClientSub2019_eula.txt.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.sl-si.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Data.Common.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\HomeBusinessR_OEM_Perp2-ul-oob.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\Personal2019R_Grace-ppd.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\OneNoteVL_MAK-ppd.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Office16\LogoImages\WinWordLogoSmall.contrast-black_scale-140.png.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Common Files\microsoft shared\VSTO\vstoee90.tlb.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Java\jdk-1.8\legal\javafx\jpeg_fx.md.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Java\jre-1.8\lib\deploy\messages_zh_HK.properties.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\O365HomePremR_SubTest4-ppd.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\O365EduCloudEDUR_SubTrial-ppd.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\OutlookVL_MAK-ul-phn.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\fsdefinitions\main\zh-changjei.xml.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\ja-JP\mshwLatin.dll.mui.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Private.CoreLib.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Internet Explorer\uk-UA\iexplore.exe.mui.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Office16\AdeModule.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\6.0.27\System.Diagnostics.FileVersionInfo.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\es\System.Windows.Forms.Design.resources.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Java\jre-1.8\bin\api-ms-win-crt-convert-l1-1-0.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\ProjectProO365R_SubTest-ul-oob.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\System.Windows.Extensions.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Java\jdk-1.8\bin\api-ms-win-core-console-l1-2-0.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Java\jdk-1.8\bin\api-ms-win-crt-stdio-l1-1-0.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\ProPlus2019VL_MAK_AE-ul-oob.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\C2RINTL.ro-ro.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.IO.FileSystem.Watcher.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\fr\UIAutomationProvider.resources.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\es\System.Xaml.resources.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\PublisherR_OEM_Perp-pl.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Common Files\microsoft shared\ink\uk-UA\tipresx.dll.mui.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.2\System.Linq.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Java\jdk-1.8\jre\lib\tzdb.dat.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Google\Chrome\Application\123.0.6312.123\Locales\ro.pak.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\OneNoteVL_MAK-pl.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Office16\1033\QuickStyles\centered.dotx.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Office16\ADDINS\PowerPivot Excel Add-in\Microsoft.AnalysisServices.Excel.BackEnd.XmlSerializers.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\7.0.16\System.Console.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Java\jdk-1.8\lib\packager.jar.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\Access2019R_OEM_Perp-pl.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\OneNoteVL_KMS_Client-ppd.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\7.0.16\System.CodeDom.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.2\tr\WindowsFormsIntegration.resources.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Office16\LogoImages\OneNoteLogoSmall.contrast-white_scale-80.png.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.2\ko\System.Windows.Input.Manipulations.resources.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Java\jre-1.8\lib\fonts\LucidaSansRegular.ttf.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\HomeStudent2019R_Retail-ppd.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\MondoR_Retail-pl.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\7-Zip\Lang\nb.txt.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Common Files\microsoft shared\ClickToRun\AppVScripting.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\6.0.27\de\UIAutomationClient.resources.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App\8.0.2\es\System.Windows.Controls.Ribbon.resources.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\Outlook2019R_Retail-ul-oob.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\ProjectProCO365R_SubTest-pl.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Office16\1033\DataServices\FOLDER.ICO.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.2\System.Globalization.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\dotnet\shared\Microsoft.NETCore.App\8.0.2\System.Runtime.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Java\jre-1.8\bin\sspi_bridge.dll.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Licenses16\Word2019R_OEM_Perp-ppd.xrm-ms.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Google\Chrome\Application\123.0.6312.123\Locales\sr.pak.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Document Themes 16\Integral.thmx.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\Microsoft Office\root\Document Themes 16\Theme Fonts\Garamond-TrebuchetMs.xml.tmp	b1f34545b8b667713d9bf012153ce820N.exe
File created	C:\Program Files\7-Zip\Lang\br.txt.tmp	b1f34545b8b667713d9bf012153ce820N.exe

System Location Discovery: System Language Discovery 1 TTPs 1 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b1f34545b8b667713d9bf012153ce820N.exe

C:\Users\Admin\AppData\Local\Temp\b1f34545b8b667713d9bf012153ce820N.exe
"C:\Users\Admin\AppData\Local\Temp\b1f34545b8b667713d9bf012153ce820N.exe"
1⤵
- Drops file in Program Files directory
- System Location Discovery: System Language Discovery
PID:1776

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\$Recycle.Bin\S-1-5-21-786284298-625481688-3210388970-1000\desktop.ini.tmp

Filesize
28KB

MD5
23b328d7a43e1a082019da0ad038af2f

SHA1
1746a470bc438a00e3aa12acec27ce0007d71af3

SHA256
dcce41b47fec2aeb027a8fec4fad219153b8a4546f5945d633d718a71c87c28b

SHA512
54747b216e19c25cb91d6367158d089d8bfd8af8ebfd795c3274bf1ec4c54b602c08351fed33ecbc5fadf9eec27ab2ec319f64eea809d1b166fc0936a7461733

Download Submit
C:\Program Files\7-Zip\7-zip.dll.tmp

Filesize
126KB

MD5
2728f42b182e7ccd814a41cd855892ab

SHA1
b4bc7dab79adecb09a339852ea30c551e6861f17

SHA256
f23165dcbc13445428c2644da9759d05ca7e03a1885f052ddd8e98356af78253

SHA512
d05512a49e47b0d631241e8b77484200aeedb85fad609ce0e292fbf5d2180b814f9fe898164ae14fb68b32305cce766a17cb2cf6d0ac512207a002ebecb3d608

Download Submit
memory/1776-0-0x0000000000400000-0x000000000040A000-memory.dmp

Filesize
40KB

Download
memory/1776-1009-0x0000000000400000-0x000000000040A000-memory.dmp

Filesize
40KB

Download