juko | bb81c3909bcb1b9d474c4ea83eb5aaa9cd4e2fcab47e18d67f2791885cc82236

General

Target
2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_elex_wannacry.exe
Size 64KB
Sample260511-raznlse19k
SHA256 bb81c3909bcb1b9d474c4ea83eb5aaa9cd4e2fcab47e18d67f2791885cc82236
MD5 02f2d3681f2f3a3a82930a300aacc6bd
SHA1 2dbe3c67649a2491bb83f2735f641e7e09d2f456
SHA512 6c0e565d3d230b826d4db7946d5f724e73927ac64879cae60755825e3fee104fda1c9da179cd9bd7d5435c5e738b3a1cdf7319b761c04a7902b78988204d6992
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uq:sLy2Kerc64CiGIm8so28q
TLSH
T15F535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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/0x000b00000002166e-4.dat	family_juko
behavioral1/files/0x0009000000024432-14.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-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_elex_wannacry.exe
Key value queried	\REGISTRY\USER\S-1-5-21-914486190-3969805341-592249730-1000\Control Panel\International\Geo\Nation	WINWORD.exe

Executes dropped EXE 2 IoCs

pid	Process
3756	WINWORD.exe
5472	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-1-5-21-914486190-3969805341-592249730-1000\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	2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_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
3084	cmd.exe
4308	PING.EXE
4608	PING.EXE
4136	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4136	PING.EXE
4308	PING.EXE
4608	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 5352 wrote to memory of 3756	5352	2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_elex_wannacry.exe	86
PID 3756 wrote to memory of 3084	3756	WINWORD.exe	87
PID 3084 wrote to memory of 4308	3084	cmd.exe	89
PID 3084 wrote to memory of 4608	3084	cmd.exe	90
PID 3084 wrote to memory of 4136	3084	cmd.exe	91
PID 3084 wrote to memory of 5472	3084	cmd.exe	92

C:\Users\Admin\AppData\Local\Temp\2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-11_02f2d3681f2f3a3a82930a300aacc6bd_elex_wannacry.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:5352
- 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:3756
- - 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\00007BD0" 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:3084
  - - 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:4308
  - - 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:4608
  - - 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:4136
  - - 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:5472

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

00007BD0

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007BD0
Size 64KB
SHA256 347372bd3ffea370fdedaf0d0c2ca2e5c63372ff69a4490a6d130f1bcbb47ac7
MD5 ac4311a68e63c2efa2eadb40c314eb73
SHA1 a6e6524822455e318e1f310acce117698cb58d14
SHA512 ef55a85aaf9c71b47d4ff079d3ed54ad5554593f9c9b123008acabbbe3a4335fb0dcbfe8057c4dc2ef91637c513db62235a638b3a784703797f9b53a08eba2fd
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uo:sLy2Kerc64CiGIm8so28o
TLSH
T1D8535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 64KB
SHA256 bb81c3909bcb1b9d474c4ea83eb5aaa9cd4e2fcab47e18d67f2791885cc82236
MD5 02f2d3681f2f3a3a82930a300aacc6bd
SHA1 2dbe3c67649a2491bb83f2735f641e7e09d2f456
SHA512 6c0e565d3d230b826d4db7946d5f724e73927ac64879cae60755825e3fee104fda1c9da179cd9bd7d5435c5e738b3a1cdf7319b761c04a7902b78988204d6992
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uq:sLy2Kerc64CiGIm8so28q
TLSH
T15F535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/3756-13-0x00000000024B0000-0x0000000002593000-memory.dmp

Download

memory/5352-11-0x0000000002590000-0x0000000002673000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads