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
behavioral2/memory/5220-0-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000d000000016cd6-5.dat	family_juko
behavioral2/memory/5220-9-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/2456-12-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/files/0x000d00000001c541-13.dat	family_juko
behavioral2/memory/5140-15-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko
behavioral2/memory/5140-16-0x0000000000400000-0x000000000041F000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2456	WINWORD.exe
5140	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-1-5-21-3989226554-2204910950-1522900112-1000\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
1272	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
1272	cmd.exe
3696	PING.EXE
3436	PING.EXE
5792	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
5792	PING.EXE
3696	PING.EXE
3436	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5220 wrote to memory of 2456	5220	2026-09-04_8a0fb1f13cc51c568392993a6df6e8aa_elex_wannacry.exe	89
PID 2456 wrote to memory of 1272	2456	WINWORD.exe	90
PID 1272 wrote to memory of 3696	1272	cmd.exe	92
PID 1272 wrote to memory of 3436	1272	cmd.exe	93
PID 1272 wrote to memory of 5792	1272	cmd.exe	94
PID 1272 wrote to memory of 5140	1272	cmd.exe	95

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5220
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2456
- - 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\00000E08" 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:1272
  - - 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:3696
  - - 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:3436
  - - 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:5792
  - - 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:5140

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

Remote System Discovery

1

T1018

System Information Discovery

1

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

00000E08

Path C:\Users\Admin\AppData\Roaming\Mozilla\00000E08
Size 57KB
SHA256 de648f2671a4d00930f06284202c45eb67f3d275829555cca0ef2bc9941ca112
MD5 cfa7a254c1c412c97bf84d81cadfc10d
SHA1 f505fd2f0d11199972aed77b9719d3022eacdeb2
SHA512 c39b46f39d3a50cd505ee496a3402d47cdfdb72f0fd5b69fd689c26939c80a70453a26bf385730b0ce234780b7b633aa205847272f2dcc681616e994877efa1f
SSDEEP 1536:zcLsF2Kerc64sTiX2IV0DgsfrfWJF2+BD9Dmqax:wLy2Kerc64CiGImEsoDfax
TLSH
T1E8433913366414D1D8BB2138A4025E354BB8BDB21467F622B750BA1E1D779DACFAC3CE
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/2456-12-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5140-15-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5140-16-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5220-0-0x0000000000400000-0x000000000041F000-memory.dmp

Download

memory/5220-9-0x0000000000400000-0x000000000041F000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads