ryuk | 4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539

Analysis

max time kernel
180s
max time network
148s
platform
windows7_x64
resource
win7-en-20211208
submitted
20-02-2022 07:39

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General

Target

4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
Size

188KB
MD5

d2d3d877e06b0181b67c6e610b40c44c
SHA1

6a0dd2ab04d5b0b6869d5b7d9b4eb591087bace9
SHA256

4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539
SHA512

320cc4f1862425d706c4d369fa5f13a62cc9f3454dae91b239a28440c14dd92972b8d1cfa4fea699dc996e67c3a4db49b4c4ed6e63329492ee6cf8f4f7059cf0

Score

10^/10

ryuk ransomware

Malware Config

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\RyukReadMe.html

Family

ryuk

Ransom Note

<html><body><p style="font-weight:bold;font-size:125%;top:0;left:0;"> [email protected] <br> </p><p style="position:absolute;bottom:0;right:1%;font-weight:bold;font-size:170%">balance of shadow universe</p><div style="font-size: 550%;font-weight:bold;width:50%;height:50%;overflow:auto;margin:auto;position:absolute;top:35%;left:40%;">Ryuk</div></body></html��

Emails

[email protected]

Extracted

Path

C:\Users\Admin\AppData\Local\Temp\RyukReadMe.html

Family

ryuk

Ransom Note

[email protected] balance of shadow universe Ryuk

Emails

[email protected]

Signatures

Ryuk
Ransomware distributed via existing botnets, often Trickbot or Emotet.
ransomware ryuk
Executes dropped EXE 1 IoCs

Processes:

JukCrnS.exe

pid process

520 JukCrnS.exe

pid	process
520	JukCrnS.exe

Loads dropped DLL 2 IoCs

Processes:

4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe

pid	process
1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Runs net.exe

Suspicious behavior: EnumeratesProcesses 9 IoCs

Processes:

4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exeJukCrnS.exe

pid	process
1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
520	JukCrnS.exe
1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
520	JukCrnS.exe
1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
520	JukCrnS.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exeJukCrnS.exe

description	pid	process
Token: SeBackupPrivilege	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
Token: SeBackupPrivilege	520	JukCrnS.exe

Suspicious use of WriteProcessMemory 64 IoCs

Processes:

4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exenet.exenet.exenet.exenet.exeJukCrnS.exenet.exenet.exenet.exe

description	pid	process	target process
PID 1916 wrote to memory of 520	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	JukCrnS.exe
PID 1916 wrote to memory of 520	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	JukCrnS.exe
PID 1916 wrote to memory of 520	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	JukCrnS.exe
PID 1916 wrote to memory of 520	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	JukCrnS.exe
PID 1916 wrote to memory of 320	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 320	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 320	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 320	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 320 wrote to memory of 548	320	net.exe	net1.exe
PID 320 wrote to memory of 548	320	net.exe	net1.exe
PID 320 wrote to memory of 548	320	net.exe	net1.exe
PID 320 wrote to memory of 548	320	net.exe	net1.exe
PID 1916 wrote to memory of 536	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 536	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 536	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 536	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 536 wrote to memory of 1516	536	net.exe	net1.exe
PID 536 wrote to memory of 1516	536	net.exe	net1.exe
PID 536 wrote to memory of 1516	536	net.exe	net1.exe
PID 536 wrote to memory of 1516	536	net.exe	net1.exe
PID 1916 wrote to memory of 928	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 928	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 928	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 928	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 928 wrote to memory of 512	928	net.exe	net1.exe
PID 928 wrote to memory of 512	928	net.exe	net1.exe
PID 928 wrote to memory of 512	928	net.exe	net1.exe
PID 928 wrote to memory of 512	928	net.exe	net1.exe
PID 1916 wrote to memory of 860	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 860	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 860	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 860	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 860 wrote to memory of 1452	860	net.exe	net1.exe
PID 860 wrote to memory of 1452	860	net.exe	net1.exe
PID 860 wrote to memory of 1452	860	net.exe	net1.exe
PID 860 wrote to memory of 1452	860	net.exe	net1.exe
PID 520 wrote to memory of 2544	520	JukCrnS.exe	net.exe
PID 520 wrote to memory of 2544	520	JukCrnS.exe	net.exe
PID 520 wrote to memory of 2544	520	JukCrnS.exe	net.exe
PID 520 wrote to memory of 2544	520	JukCrnS.exe	net.exe
PID 2544 wrote to memory of 2568	2544	net.exe	net1.exe
PID 2544 wrote to memory of 2568	2544	net.exe	net1.exe
PID 2544 wrote to memory of 2568	2544	net.exe	net1.exe
PID 2544 wrote to memory of 2568	2544	net.exe	net1.exe
PID 1916 wrote to memory of 2700	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 2700	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 2700	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 2700	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 1456	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 1456	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 1456	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1916 wrote to memory of 1456	1916	4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe	net.exe
PID 1456 wrote to memory of 9400	1456	net.exe	net1.exe
PID 1456 wrote to memory of 9400	1456	net.exe	net1.exe
PID 1456 wrote to memory of 9400	1456	net.exe	net1.exe
PID 1456 wrote to memory of 9400	1456	net.exe	net1.exe
PID 2700 wrote to memory of 9408	2700	net.exe	net1.exe
PID 2700 wrote to memory of 9408	2700	net.exe	net1.exe
PID 2700 wrote to memory of 9408	2700	net.exe	net1.exe
PID 2700 wrote to memory of 9408	2700	net.exe	net1.exe
PID 520 wrote to memory of 9468	520	JukCrnS.exe	net.exe
PID 520 wrote to memory of 9468	520	JukCrnS.exe	net.exe
PID 520 wrote to memory of 9468	520	JukCrnS.exe	net.exe
PID 520 wrote to memory of 9468	520	JukCrnS.exe	net.exe

C:\Users\Admin\AppData\Local\Temp\4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe
"C:\Users\Admin\AppData\Local\Temp\4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539.exe"
1⤵
- Loads dropped DLL
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1916
- C:\Users\Admin\AppData\Local\Temp\JukCrnS.exe
  "C:\Users\Admin\AppData\Local\Temp\JukCrnS.exe" 8 LAN
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:520
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\System32\net.exe" stop "samss" /y
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2544
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 stop "samss" /y
      4⤵
      PID:2568
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\System32\net.exe" stop "samss" /y
    3⤵
    PID:9468
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 stop "samss" /y
      4⤵
      PID:9492
- - C:\Windows\SysWOW64\net.exe
    "C:\Windows\System32\net.exe" stop "samss" /y
    3⤵
    PID:23592
  - - C:\Windows\SysWOW64\net1.exe
      C:\Windows\system32\net1 stop "samss" /y
      4⤵
      PID:23632
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:320
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
    3⤵
    PID:548
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:536
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:1516
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "audioendpointbuilder" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:928
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "audioendpointbuilder" /y
    3⤵
    PID:512
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:860
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:1452
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1456
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:9400
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2700
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:9408
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  PID:24528
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:24568
- C:\Windows\SysWOW64\net.exe
  "C:\Windows\System32\net.exe" stop "samss" /y
  2⤵
  PID:24520
- - C:\Windows\SysWOW64\net1.exe
    C:\Windows\system32\net1 stop "samss" /y
    3⤵
    PID:23568

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\ProgramData\Microsoft\Crypto\RSA\MachineKeys\08e575673cce10c72090304839888e02_bc8e1036-7fb3-448e-8ad9-a824b1a03b8e

MD5
93a5aadeec082ffc1bca5aa27af70f52

SHA1
47a92aee3ea4d1c1954ed4da9f86dd79d9277d31

SHA256
a1a21799e98f97f271657ce656076f33dcb020d9370f1f2671d783cafd230294

SHA512
df388c8d83e779e006d6311b2046fcf9259ec33d379fc0e2c6a4b6b90418f587a12c5c23acd488413a02568ca2d3effe04608ec7c791925c7ed53dc71093ca45

Download Submit
C:\Users\Admin\AppData\Local\Temp\JukCrnS.exe

MD5
d2d3d877e06b0181b67c6e610b40c44c

SHA1
6a0dd2ab04d5b0b6869d5b7d9b4eb591087bace9

SHA256
4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539

SHA512
320cc4f1862425d706c4d369fa5f13a62cc9f3454dae91b239a28440c14dd92972b8d1cfa4fea699dc996e67c3a4db49b4c4ed6e63329492ee6cf8f4f7059cf0

Download Submit
C:\Users\Admin\AppData\Local\Temp\RyukReadMe.html

MD5
9272789784b6e871f6776984e0e1061c

SHA1
6631af3402f126d6fc49cb6d9e73d63ef3f329b3

SHA256
255e145cba8b7ac0c7d1b82be87cb09f841cff07808895a7b592a04ead1aee0a

SHA512
af6935acb607119c5bd88be90e84f712da03b5cc805d440ae581e3c03a0fe0b4749938f306f55a66714446e2501a6feaf603e7990f45104a3f363b552ad77f68

Download Submit
\Users\Admin\AppData\Local\Temp\JukCrnS.exe

MD5
d2d3d877e06b0181b67c6e610b40c44c

SHA1
6a0dd2ab04d5b0b6869d5b7d9b4eb591087bace9

SHA256
4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539

SHA512
320cc4f1862425d706c4d369fa5f13a62cc9f3454dae91b239a28440c14dd92972b8d1cfa4fea699dc996e67c3a4db49b4c4ed6e63329492ee6cf8f4f7059cf0

Download Submit
\Users\Admin\AppData\Local\Temp\JukCrnS.exe

MD5
d2d3d877e06b0181b67c6e610b40c44c

SHA1
6a0dd2ab04d5b0b6869d5b7d9b4eb591087bace9

SHA256
4b5b08346e369b59cae2120fcdc16b720bf2f2ec74115045cfafc24eecccb539

SHA512
320cc4f1862425d706c4d369fa5f13a62cc9f3454dae91b239a28440c14dd92972b8d1cfa4fea699dc996e67c3a4db49b4c4ed6e63329492ee6cf8f4f7059cf0

Download Submit
memory/1916-54-0x0000000075761000-0x0000000075763000-memory.dmp

Filesize
8KB

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