juko | 1d9105dbebf105306773d47b78f17dc359c6fe9f8374e50c9480efc9407bdd97

General

Target
2026-09-04_8a0fb1f13cc51c568392993a6df6e8aa_elex_wannacry.exe
Size 57KB
Sample260905-ex772sem7x
SHA256 1d9105dbebf105306773d47b78f17dc359c6fe9f8374e50c9480efc9407bdd97
MD5 8a0fb1f13cc51c568392993a6df6e8aa
SHA1 2d0e687f055766e9c2928bfb85cb3a8190237318
SHA512 0b2a0d78bc25a792abc96aa0b6f0aab636adc6074d46d53734ab588ee9559908a963d020dde6ce6f5329e164843c203cb5f5cfa2da29be54cfc0f6479b190956
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaY:wLy2Kerc64CiGImEsoDfaY
TLSH
T160433913366414D1D8AB2138A4025E354BB8BDF21467F622B750BA1E1D779DACFA83CE
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery execution juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 7 IoCs

resource	yara_rule
behavioral1/memory/3120-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/files/0x000c0000000243c4-5.dat	family_juko
behavioral1/memory/3120-11-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/memory/1672-14-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/files/0x0008000000024686-15.dat	family_juko
behavioral1/memory/2100-17-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral1/memory/2100-18-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Checks computer location settings 2 TTPs 2 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\Control Panel\International\Geo\Nation	2026-09-04_8a0fb1f13cc51c568392993a6df6e8aa_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
1672	WINWORD.exe
2100	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-668679576-120646659-2289335452-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Executes a command shell one-liner 1 TTPs 1 IoCs

Execution of a cmd.exe one-liner (/c "close" or /k "keep") is a common script/loader stage.

execution

Windows Command Shell

T1059.003

pid	Process
4872	cmd.exe

System Location Discovery: System Language Discovery 1 TTPs 7 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	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-09-04_8a0fb1f13cc51c568392993a6df6e8aa_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
1612	PING.EXE
4332	PING.EXE
4108	PING.EXE
4872	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1612	PING.EXE
4332	PING.EXE
4108	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3120 wrote to memory of 1672	3120	2026-09-04_8a0fb1f13cc51c568392993a6df6e8aa_elex_wannacry.exe	87
PID 1672 wrote to memory of 4872	1672	WINWORD.exe	89
PID 4872 wrote to memory of 1612	4872	cmd.exe	91
PID 4872 wrote to memory of 4332	4872	cmd.exe	92
PID 4872 wrote to memory of 4108	4872	cmd.exe	93
PID 4872 wrote to memory of 2100	4872	cmd.exe	94

C:\Users\Admin\AppData\Local\Temp\2026-09-04_8a0fb1f13cc51c568392993a6df6e8aa_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-04_8a0fb1f13cc51c568392993a6df6e8aa_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3120
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1672
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00005C34" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - Executes a command shell one-liner
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4872
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:1612
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4332
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4108
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:2100

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Windows Command Shell

1

T1059.003

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

Remote System Discovery

1

T1018

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00005C34

Path C:\Users\Admin\AppData\Roaming\Mozilla\00005C34
Size 57KB
SHA256 2cd3eb47c69458c3be8b38d247e32baac13e568e3616536ab2398436df18c4e2
MD5 583083c4198932498d5f8e273226a24c
SHA1 9539c9ad37d4f259086d6a30c7f0816e87077eeb
SHA512 bfded2742fd69515ce1eddc315bc9e1e9edcd2e0db06651da4ae849bbf054acf356ec96a9923b7f5ceeee09626cff4fa3fa781c08f4bd88df6f7427bf3f92b8d
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaJ:wLy2Kerc64CiGImEsoDfaJ
TLSH
T1F9433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 57KB
SHA256 1d9105dbebf105306773d47b78f17dc359c6fe9f8374e50c9480efc9407bdd97
MD5 8a0fb1f13cc51c568392993a6df6e8aa
SHA1 2d0e687f055766e9c2928bfb85cb3a8190237318
SHA512 0b2a0d78bc25a792abc96aa0b6f0aab636adc6074d46d53734ab588ee9559908a963d020dde6ce6f5329e164843c203cb5f5cfa2da29be54cfc0f6479b190956
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9DmqaY:wLy2Kerc64CiGImEsoDfaY
TLSH
T160433913366414D1D8AB2138A4025E354BB8BDF21467F622B750BA1E1D779DACFA83CE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1672-14-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/2100-17-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/2100-18-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/3120-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/3120-11-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads