juko | c307056b3adeb0ed1f5f3b758874ec771c4ce974ef0a19e871332f89e0a44e96

General

Target
2026-06-26_b38420c930e3ba9be52526e39886ce8f_elex_wannacry.exe
Size 64KB
Sample260629-qaattad121
SHA256 c307056b3adeb0ed1f5f3b758874ec771c4ce974ef0a19e871332f89e0a44e96
MD5 b38420c930e3ba9be52526e39886ce8f
SHA1 85efcc75dd0aa3c8720ba4fda37c8c2fa3a5263b
SHA512 e2baa3c81941736d9fb447957439a0a04f2f226095bd0872d3b742266a679a50b34cf6c3f640d06023e69879188677491ee37d9ff7a6849af14aef39bd049fe6
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uj:sLy2Kerc64CiGIm8so28j
TLSH
T11D535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

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

Detects Juko 2 IoCs

resource	yara_rule
behavioral1/files/0x000b000000016817-4.dat	family_juko
behavioral1/files/0x000a00000002422e-12.dat	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-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	WINWORD.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1788976790-1541110888-1636651838-1000\Control Panel\International\Geo\Nation	2026-06-26_b38420c930e3ba9be52526e39886ce8f_elex_wannacry.exe

Executes dropped EXE 2 IoCs

pid	Process
2680	WINWORD.exe
1140	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-1-5-21-1788976790-1541110888-1636651838-1000\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

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	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
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-06-26_b38420c930e3ba9be52526e39886ce8f_elex_wannacry.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
2620	cmd.exe
1256	PING.EXE
4880	PING.EXE
1656	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1256	PING.EXE
4880	PING.EXE
1656	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2396 wrote to memory of 2680	2396	2026-06-26_b38420c930e3ba9be52526e39886ce8f_elex_wannacry.exe	84
PID 2680 wrote to memory of 2620	2680	WINWORD.exe	85
PID 2620 wrote to memory of 1256	2620	cmd.exe	87
PID 2620 wrote to memory of 4880	2620	cmd.exe	88
PID 2620 wrote to memory of 1656	2620	cmd.exe	89
PID 2620 wrote to memory of 1140	2620	cmd.exe	90

C:\Users\Admin\AppData\Local\Temp\2026-06-26_b38420c930e3ba9be52526e39886ce8f_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-06-26_b38420c930e3ba9be52526e39886ce8f_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2396
- 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:2680
- - 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\00004235" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:2620
  - - 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:1256
  - - 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:4880
  - - 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:1656
  - - 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:1140

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

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

Replay Monitor

Loading Replay Monitor...

Downloads

00004235

Path C:\Users\Admin\AppData\Roaming\Mozilla\00004235
Size 64KB
SHA256 be0360a0542bae9fdddd0ba435951677b5cfc8a730d1242828d2099775ef1d74
MD5 7a054ac5528b20bc4b5185543c731539
SHA1 c04dd49619688c45532bfe79c501eb16026948be
SHA512 38000fcfa86b747efc5e5a59a5c0b732ac1b574b92360fdfdba681e01666bcdd3ff8a2a9a99a4da131e6e031674113b11b5ff8fcd3a1b707f434a1568edb114f
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/ut:sLy2Kerc64CiGIm8so28t
TLSH
T15D535C2EA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 c307056b3adeb0ed1f5f3b758874ec771c4ce974ef0a19e871332f89e0a44e96
MD5 b38420c930e3ba9be52526e39886ce8f
SHA1 85efcc75dd0aa3c8720ba4fda37c8c2fa3a5263b
SHA512 e2baa3c81941736d9fb447957439a0a04f2f226095bd0872d3b742266a679a50b34cf6c3f640d06023e69879188677491ee37d9ff7a6849af14aef39bd049fe6
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uj:sLy2Kerc64CiGIm8so28j
TLSH
T11D535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

Replay Monitor

Loading Replay Monitor...

Downloads