juko | e7287f7411d3c20d75b120c05aa51eaa954eaa3ed35d429691779f0e173b6cb4

General

Target
2026-08-02_eb9665ca0bde5b2a884001b929c7fda6_elex_wannacry.exe
Size 88KB
Sample260802-qpsyyaaf59
SHA256 e7287f7411d3c20d75b120c05aa51eaa954eaa3ed35d429691779f0e173b6cb4
MD5 eb9665ca0bde5b2a884001b929c7fda6
SHA1 98e0b8e23e06d3c3f3a85c2f0edcebdaac8bd713
SHA512 2f47ed88e3ddd7c95faacdde5b643068441e786daafed64aa1269396533abc7de3b1e790f0b0fe78138f98e0d8a4d905f3f245bf724305b16bf209e9e25c4b84
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsd:zLy2Kerc64CiGImHc/28wzCBlycJWeeG
TLSH
T1EB933B2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
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/936-0-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000b000000019caa-5.dat	family_juko
behavioral2/memory/936-9-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/4952-12-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/files/0x000f00000001c599-13.dat	family_juko
behavioral2/memory/8-15-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko
behavioral2/memory/8-16-0x0000000000400000-0x000000000042A000-memory.dmp	family_juko

Executes dropped EXE 2 IoCs

pid	Process
4952	WINWORD.exe
8	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-1-5-21-2301830172-776172150-2531349243-1000\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
2164	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	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	2026-08-02_eb9665ca0bde5b2a884001b929c7fda6_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
4480	PING.EXE
2988	PING.EXE
5140	PING.EXE
2164	cmd.exe

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
4480	PING.EXE
2988	PING.EXE
5140	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 936 wrote to memory of 4952	936	2026-08-02_eb9665ca0bde5b2a884001b929c7fda6_elex_wannacry.exe	89
PID 4952 wrote to memory of 2164	4952	WINWORD.exe	90
PID 2164 wrote to memory of 4480	2164	cmd.exe	92
PID 2164 wrote to memory of 2988	2164	cmd.exe	93
PID 2164 wrote to memory of 5140	2164	cmd.exe	94
PID 2164 wrote to memory of 8	2164	cmd.exe	95

C:\Users\Admin\AppData\Local\Temp\2026-08-02_eb9665ca0bde5b2a884001b929c7fda6_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-08-02_eb9665ca0bde5b2a884001b929c7fda6_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:936
- 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:4952
- - 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\000079DC" 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:2164
  - - 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:4480
  - - 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:2988
  - - 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:5140
  - - 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:8

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

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Downloads

000079DC

Path C:\Users\Admin\AppData\Roaming\Mozilla\000079DC
Size 88KB
SHA256 04f8c7c98cd989c00cbe1f5f39e9fe78ca127e4cf92376f6afeb1815f62ff24b
MD5 7e814958be42cbca2ea7c3bf08c47031
SHA1 3e4f0ca932d09c3bcbbd26b152006b7e9fe76280
SHA512 ee43ffb61be604ac6cf2294e11364c29f836fe44808b4f5be3bed22b66eecf238d8b02312eecc854e9a67d0ffbd35e4e2b1dcc22cbfe77fedd7702164d34c3a4
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsG:zLy2Kerc64CiGImHc/28wzCBlycJWeet
TLSH
T183933C2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 88KB
SHA256 e7287f7411d3c20d75b120c05aa51eaa954eaa3ed35d429691779f0e173b6cb4
MD5 eb9665ca0bde5b2a884001b929c7fda6
SHA1 98e0b8e23e06d3c3f3a85c2f0edcebdaac8bd713
SHA512 2f47ed88e3ddd7c95faacdde5b643068441e786daafed64aa1269396533abc7de3b1e790f0b0fe78138f98e0d8a4d905f3f245bf724305b16bf209e9e25c4b84
SSDEEP 1536:zLsF2Kerc64sTiX2IV0D7c/wGeP58ORX73iu/uwzCR3lsl5cN35fWJcedCgVjrsd:zLy2Kerc64CiGImHc/28wzCBlycJWeeG
TLSH
T1EB933B2EA59320FCCA5BC170C6BB6732D4357C251035B63E6344FB352E70E62AB29E59
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

memory/8-15-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/8-16-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/936-0-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/936-9-0x0000000000400000-0x000000000042A000-memory.dmp

Download

memory/4952-12-0x0000000000400000-0x000000000042A000-memory.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads