juko | fc87b2a36c8fe3a67ff7986bcec0114673877cfb574d80516b8974def10aff82

General

Target
2026-09-08_11dc2fe64913f417c8566c1ede819a9e_elex_wannacry.exe
Size 88KB
Sample260910-jay33shp3t
SHA256 fc87b2a36c8fe3a67ff7986bcec0114673877cfb574d80516b8974def10aff82
MD5 11dc2fe64913f417c8566c1ede819a9e
SHA1 144e0f5fcd8ef0634a5cc6c73ea67c836fa8e341
SHA512 f8039337f0e7ce18b7640f4e32a2aeec694e4651943d7980898802c7f19cda68961e2d52a5d5b74ffdbd56704660da58174705f151c844febdbcbe56e0bb42d8
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsi:zLy2Kerc64CiGImHc/28wzCBlycJWee5
TLSH
T1DC933B2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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 8 IoCs

resource	yara_rule
behavioral1/memory/2636-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000c0000000240f5-5.dat	family_juko
behavioral1/memory/2324-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/2636-13-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/2324-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/files/0x000900000002435a-16.dat	family_juko
behavioral1/memory/3236-18-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral1/memory/3236-19-0x0000000000400000-0x000000000042A000-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-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	2026-09-08_11dc2fe64913f417c8566c1ede819a9e_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-889581200-2041691093-2048517887-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2324	WINWORD.exe
3236	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-1-5-21-889581200-2041691093-2048517887-1000\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
3092	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	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	2026-09-08_11dc2fe64913f417c8566c1ede819a9e_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.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
3092	cmd.exe
1972	PING.EXE
4508	PING.EXE
2132	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1972	PING.EXE
4508	PING.EXE
2132	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2636 wrote to memory of 2324	2636	2026-09-08_11dc2fe64913f417c8566c1ede819a9e_elex_wannacry.exe	85
PID 2324 wrote to memory of 3092	2324	WINWORD.exe	86
PID 3092 wrote to memory of 1972	3092	cmd.exe	88
PID 3092 wrote to memory of 4508	3092	cmd.exe	89
PID 3092 wrote to memory of 2132	3092	cmd.exe	90
PID 3092 wrote to memory of 3236	3092	cmd.exe	91

C:\Users\Admin\AppData\Local\Temp\2026-09-08_11dc2fe64913f417c8566c1ede819a9e_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-09-08_11dc2fe64913f417c8566c1ede819a9e_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2636
- 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:2324
- - 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\00002644" 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:3092
  - - 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:1972
  - - 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:4508
  - - 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:2132
  - - 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:3236

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

00002644

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002644
Size 88KB
SHA256 b59929a715677ae659567824d76b4b6f007768a4a6259565598f95ed8f81dc95
MD5 907767cfded408bc1b1546eb45df3dd5
SHA1 35e71b13850039e403c4a57a032f1973303dd52f
SHA512 41721f0471aaa35189e28629dfd6a1d50c509894915c87946395fa3d4fc3011ddc3234bdd1b5b97c1cea727f47c7dc46b744c43e54aa489e81f34d356247f0b7
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsO:zLy2Kerc64CiGImHc/28wzCBlycJWeet
TLSH
T115933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 fc87b2a36c8fe3a67ff7986bcec0114673877cfb574d80516b8974def10aff82
MD5 11dc2fe64913f417c8566c1ede819a9e
SHA1 144e0f5fcd8ef0634a5cc6c73ea67c836fa8e341
SHA512 f8039337f0e7ce18b7640f4e32a2aeec694e4651943d7980898802c7f19cda68961e2d52a5d5b74ffdbd56704660da58174705f151c844febdbcbe56e0bb42d8
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsi:zLy2Kerc64CiGImHc/28wzCBlycJWee5
TLSH
T1DC933B2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/2324-12-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/2324-15-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/2636-0-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/2636-13-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/3236-18-0x0000000000400000-0x000000000042A000-memory.dmp

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memory/3236-19-0x0000000000400000-0x000000000042A000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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