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
behavioral2/files/0x00180000000115b6-4.dat	family_juko
behavioral2/files/0x000f00000001c53c-10.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
3316	WINWORD.exe
5152	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-1-5-21-4118910392-3846778420-3545080915-1000\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	2026-06-26_b38420c930e3ba9be52526e39886ce8f_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
5724	cmd.exe
3280	PING.EXE
5956	PING.EXE
4580	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
3280	PING.EXE
5956	PING.EXE
4580	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 4164 wrote to memory of 3316	4164	2026-06-26_b38420c930e3ba9be52526e39886ce8f_elex_wannacry.exe	89
PID 3316 wrote to memory of 5724	3316	WINWORD.exe	90
PID 5724 wrote to memory of 3280	5724	cmd.exe	92
PID 5724 wrote to memory of 5956	5724	cmd.exe	93
PID 5724 wrote to memory of 4580	5724	cmd.exe	94
PID 5724 wrote to memory of 5152	5724	cmd.exe	95

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⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4164
- 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:3316
- - 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⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:5724
  - - 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:3280
  - - 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:5956
  - - 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:4580
  - - 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:5152

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

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

00002644

Path C:\Users\Admin\AppData\Roaming\Mozilla\00002644
Size 64KB
SHA256 75cc1351e485b2183fc400e7d720eea8d2ae863052eb35829668c7bf83a0a5a0
MD5 f56f8989af7d5357ad6dc991960cbc3c
SHA1 3dfb6cc8457df76b0f4b0f450c4979200b91cf41
SHA512 cfa714bb69649e0a0d3456f38902de082e5d93974b13eb778eb41d6ca8662da536643b7f4d563c6911772d1bffa4d985be15116473aab8a258c1827a729e87f3
SSDEEP 1536:sLsF2Kerc64sTiX2IV0DgsowGeP58ORX73iu/uP:sLy2Kerc64CiGIm8so28P
TLSH
T1DF535C2AA5A220B8C95780B0D5776B32D4397C350036767EA345FF312E71E12EB25E9E
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

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