juko | 9399daf23f4cacf40bf3aaec37f91050b3edccee9f592a346231cbea3d1d79df

General

Target
2026-05-10_d97f92b4eea5354622addb535f69a0e2_elex_wannacry.exe
Size 39KB
Sample260510-kqtc7se19k
SHA256 9399daf23f4cacf40bf3aaec37f91050b3edccee9f592a346231cbea3d1d79df
MD5 d97f92b4eea5354622addb535f69a0e2
SHA1 8b447b7b9684c4a7eb945c4451bedd59e4a6783e
SHA512 b9023e5c45f92ac24c84aa1d899f53b1ec4a301f16d68a56e2df7b4a75b6c478bd986c2b2be8385175cdf5cdd8283db18fc16dff7d8820b14d0b191ffe08b360
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBj:aLsF2Kerc64sTiX2IV0DVyIGFo
TLSH
T1CD036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
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 8 IoCs

resource	yara_rule
behavioral1/memory/3396-0-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000b0000000242f1-5.dat	family_juko
behavioral1/memory/3396-13-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2184-11-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/2184-15-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/files/0x000900000002444d-16.dat	family_juko
behavioral1/memory/1832-18-0x0000000000400000-0x000000000041D000-memory.dmp	family_juko
behavioral1/memory/1832-19-0x0000000000400000-0x000000000041D000-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-1-5-21-2023547815-1162023398-1465618254-1000\Control Panel\International\Geo\Nation	2026-05-10_d97f92b4eea5354622addb535f69a0e2_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2023547815-1162023398-1465618254-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
2184	WINWORD.exe
1832	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-1-5-21-2023547815-1162023398-1465618254-1000\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	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-10_d97f92b4eea5354622addb535f69a0e2_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
3468	cmd.exe
1864	PING.EXE
4300	PING.EXE
2248	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
1864	PING.EXE
4300	PING.EXE
2248	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3396 wrote to memory of 2184	3396	2026-05-10_d97f92b4eea5354622addb535f69a0e2_elex_wannacry.exe	86
PID 2184 wrote to memory of 3468	2184	WINWORD.exe	87
PID 3468 wrote to memory of 1864	3468	cmd.exe	89
PID 3468 wrote to memory of 4300	3468	cmd.exe	91
PID 3468 wrote to memory of 2248	3468	cmd.exe	92
PID 3468 wrote to memory of 1832	3468	cmd.exe	93

C:\Users\Admin\AppData\Local\Temp\2026-05-10_d97f92b4eea5354622addb535f69a0e2_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-10_d97f92b4eea5354622addb535f69a0e2_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:3396
- 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:2184
- - 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\000068D7" 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:3468
  - - 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:1864
  - - 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:4300
  - - 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:2248
  - - 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:1832

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

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Downloads

000068D7

Path C:\Users\Admin\AppData\Roaming\Mozilla\000068D7
Size 39KB
SHA256 32043f773a2dcc2ce8f24851277c66d79f2fe426057ec6e18bf97cdbd0a5cf12
MD5 a4ecc9ad1d2fd6fe8056f01af8ddb1ba
SHA1 7ccabf5106d76120e722f0caa54b49061eb5b717
SHA512 6ee87a77437525b6b354aba8f747ed1d203a990def8a1be3cd5bfd59a53d2ebdafaa2ee94e30af18930cdd3cb2bee400f49c9fe824668d74ddf457a31e1e4b01
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBE:aLsF2Kerc64sTiX2IV0DVyIGF3
TLSH
T150035B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 39KB
SHA256 9399daf23f4cacf40bf3aaec37f91050b3edccee9f592a346231cbea3d1d79df
MD5 d97f92b4eea5354622addb535f69a0e2
SHA1 8b447b7b9684c4a7eb945c4451bedd59e4a6783e
SHA512 b9023e5c45f92ac24c84aa1d899f53b1ec4a301f16d68a56e2df7b4a75b6c478bd986c2b2be8385175cdf5cdd8283db18fc16dff7d8820b14d0b191ffe08b360
SSDEEP 768:uZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqGNPWQHV6+UGNSyxSBj:aLsF2Kerc64sTiX2IV0DVyIGFo
TLSH
T1CD036B1B2964B062C69611B0F8696F34C03DADB4052BF052F7447B992CB6DA3DF71ACE
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/1832-18-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/1832-19-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2184-11-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/2184-15-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3396-0-0x0000000000400000-0x000000000041D000-memory.dmp

Download

memory/3396-13-0x0000000000400000-0x000000000041D000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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