juko | 6c85ee9fc7870ffedb6596df2c23eaecb84be3b1f1fff8698358fcc72cf70d2b

General

Target
2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_elex_wannacry.exe
Size 88KB
Sample260804-gt352aeb39
SHA256 6c85ee9fc7870ffedb6596df2c23eaecb84be3b1f1fff8698358fcc72cf70d2b
MD5 9e07b564f5bf4512f3d6d2e255c8ed34
SHA1 6dd49b416a0b0a36d2743b7050d2d1793ab17592
SHA512 0368352e500855cb6f218f27ba0ae771c543b4741db6d16cae0c6236f6d0d0694d1e7dbf5b5d31d09ccac993df77fe1d854dca9385331c7b74a8c2b09ce8a458
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsQ:zLy2Kerc64CiGImHc/28wzCBlycJWeeb
TLSH
T1BD933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/4144-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000f00000001b664-5.dat	family_juko
behavioral2/memory/4144-10-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/556-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000e00000001c58c-13.dat	family_juko
behavioral2/memory/1940-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/1940-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
556	WINWORD.exe
1940	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-1-5-21-2246396966-3025826688-3847171515-1000\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
2424	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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_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

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
2424	cmd.exe
2268	PING.EXE
4796	PING.EXE
5072	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4796	PING.EXE
5072	PING.EXE
2268	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4144 wrote to memory of 556	4144	2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_elex_wannacry.exe	89
PID 556 wrote to memory of 2424	556	WINWORD.exe	90
PID 2424 wrote to memory of 2268	2424	cmd.exe	92
PID 2424 wrote to memory of 4796	2424	cmd.exe	93
PID 2424 wrote to memory of 5072	2424	cmd.exe	94
PID 2424 wrote to memory of 1940	2424	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-04_9e07b564f5bf4512f3d6d2e255c8ed34_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4144
- 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:556
- - 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\00007B4A" 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:2424
  - - 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:2268
  - - 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:4796
  - - 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:5072
  - - 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:1940

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

Replay Monitor

Loading Replay Monitor...

Downloads

00007B4A

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007B4A
Size 88KB
SHA256 b6b8bf927ed84a3ae0d62feddb6f7cd65be87481e6f191843c8b0f78df0c2152
MD5 01e7de2fee7140d4b46877411acf68e2
SHA1 7945e97ab9cf208e023242f1022e6166ca6c9853
SHA512 e0e930d430517ffadad8cb7c1d5717e71d141ccfdce655bd3c490293bca040849ccb705520d6523b75d6ffd24b1c0938aa3708b0d3666cc61304cd8e50a78872
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsa:zLy2Kerc64CiGImHc/28wzCBlycJWee9
TLSH
T1B6933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 6c85ee9fc7870ffedb6596df2c23eaecb84be3b1f1fff8698358fcc72cf70d2b
MD5 9e07b564f5bf4512f3d6d2e255c8ed34
SHA1 6dd49b416a0b0a36d2743b7050d2d1793ab17592
SHA512 0368352e500855cb6f218f27ba0ae771c543b4741db6d16cae0c6236f6d0d0694d1e7dbf5b5d31d09ccac993df77fe1d854dca9385331c7b74a8c2b09ce8a458
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsQ:zLy2Kerc64CiGImHc/28wzCBlycJWeeb
TLSH
T1BD933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/556-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/1940-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/1940-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4144-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4144-10-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads