ryuk | d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

Analysis

max time kernel
150s
max time network
9s
platform
windows7_x64
resource
win7v20210410
submitted
04-05-2021 16:10

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General

Target

mSRChoAYDlan.exe
Size

140KB
MD5

c0f972c5e033c0b4dc268a805cfa16a2
SHA1

a3f38579feb14d3b20289e453b41d88232145f68
SHA256

d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488
SHA512

de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

Score

10^/10

ryuk discovery ransomware

Malware Config

Extracted

Path

C:\$Recycle.Bin\RyukReadMe.html

Family

ryuk

Ransom Note

contact balance of shadow universe Ryuk $password = '3y5fSfK'; $torlink = 'http://ojaiemvqphz6dgg7gncqpdlbx2aoisftpwvrhda67uth6ncuax2ghyad.onion'; function info(){alert("INSTRUCTION:\r\n1. Download tor browser.\r\n2. Open link through tor browser: " + $torlink + "\r\n3. Fill the form, your password: "+ $password +"\r\nWe will contact you shortly.\r\nAlways send files for test decryption.");};

URLs

http://ojaiemvqphz6dgg7gncqpdlbx2aoisftpwvrhda67uth6ncuax2ghyad.onion

Signatures

Ryuk
Ransomware distributed via existing botnets, often Trickbot or Emotet.
ransomware ryuk
Executes dropped EXE 2 IoCs

Processes:

iKGXrpzkzrep.exeVAgOHVnjGlan.exe

pid process

1544 iKGXrpzkzrep.exe
888 VAgOHVnjGlan.exe
Loads dropped DLL 4 IoCs

Processes:

mSRChoAYDlan.exe

pid process

1084 mSRChoAYDlan.exe
1084 mSRChoAYDlan.exe
1084 mSRChoAYDlan.exe
1084 mSRChoAYDlan.exe
Modifies file permissions 1 TTPs 2 IoCs
discovery

File and Directory Permissions Modification
T1222

Processes:

icacls.exeicacls.exe

pid process

1480 icacls.exe
1472 icacls.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1544	iKGXrpzkzrep.exe
888	VAgOHVnjGlan.exe

pid	process
1084	mSRChoAYDlan.exe
1084	mSRChoAYDlan.exe
1084	mSRChoAYDlan.exe
1084	mSRChoAYDlan.exe

pid	process
1480	icacls.exe
1472	icacls.exe

Suspicious use of WriteProcessMemory 8 IoCs

Processes:

mSRChoAYDlan.exe

description	pid	process	target process
PID 1084 wrote to memory of 1544	1084	mSRChoAYDlan.exe	iKGXrpzkzrep.exe
PID 1084 wrote to memory of 1544	1084	mSRChoAYDlan.exe	iKGXrpzkzrep.exe
PID 1084 wrote to memory of 1544	1084	mSRChoAYDlan.exe	iKGXrpzkzrep.exe
PID 1084 wrote to memory of 1544	1084	mSRChoAYDlan.exe	iKGXrpzkzrep.exe
PID 1084 wrote to memory of 888	1084	mSRChoAYDlan.exe	VAgOHVnjGlan.exe
PID 1084 wrote to memory of 888	1084	mSRChoAYDlan.exe	VAgOHVnjGlan.exe
PID 1084 wrote to memory of 888	1084	mSRChoAYDlan.exe	VAgOHVnjGlan.exe
PID 1084 wrote to memory of 888	1084	mSRChoAYDlan.exe	VAgOHVnjGlan.exe

C:\Users\Admin\AppData\Local\Temp\mSRChoAYDlan.exe
"C:\Users\Admin\AppData\Local\Temp\mSRChoAYDlan.exe"
1⤵
- Loads dropped DLL
- Suspicious use of WriteProcessMemory
PID:1084

C:\Users\Admin\AppData\Local\Temp\iKGXrpzkzrep.exe
"C:\Users\Admin\AppData\Local\Temp\iKGXrpzkzrep.exe" 9 REP
2⤵
- Executes dropped EXE
PID:1544

C:\Users\Admin\AppData\Local\Temp\VAgOHVnjGlan.exe
"C:\Users\Admin\AppData\Local\Temp\VAgOHVnjGlan.exe" 8 LAN
2⤵
- Executes dropped EXE
PID:888

C:\Users\Admin\AppData\Local\Temp\GiJAqpzWGlan.exe
"C:\Users\Admin\AppData\Local\Temp\GiJAqpzWGlan.exe" 8 LAN
2⤵
PID:992

C:\Windows\SysWOW64\icacls.exe
icacls "C:\*" /grant Everyone:F /T /C /Q
2⤵
- Modifies file permissions
PID:1480

C:\Windows\SysWOW64\icacls.exe
icacls "D:\*" /grant Everyone:F /T /C /Q
2⤵
- Modifies file permissions
PID:1472

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

File and Directory Permissions Modification

T1222

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\$Recycle.Bin\RyukReadMe.html

MD5
ef4f7747ff07d010fc040da223fdbc61

SHA1
2b89042ff0b635aa34ec32c0a2090cd4f781c9ae

SHA256
6a1c4bfe0368464c37652bb21a4eec21ee11f16b6f8a820c6696c6f7e5fe10c8

SHA512
0342ef5ca647586af05b99d5f82d264457d51ca44e8831acc9a1013db7ee98e2e86ef122733862f7492f0870a51136cf829978ab97ed14659f4d2d081d177a2f

Download Submit
C:\MSOCache\All Users\RyukReadMe.html

MD5
ef4f7747ff07d010fc040da223fdbc61

SHA1
2b89042ff0b635aa34ec32c0a2090cd4f781c9ae

SHA256
6a1c4bfe0368464c37652bb21a4eec21ee11f16b6f8a820c6696c6f7e5fe10c8

SHA512
0342ef5ca647586af05b99d5f82d264457d51ca44e8831acc9a1013db7ee98e2e86ef122733862f7492f0870a51136cf829978ab97ed14659f4d2d081d177a2f

Download Submit
C:\MSOCache\All Users\{90140000-0019-0409-0000-0000000FF1CE}-C\RyukReadMe.html

MD5
d41d8cd98f00b204e9800998ecf8427e

SHA1
da39a3ee5e6b4b0d3255bfef95601890afd80709

SHA256
e3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855

SHA512
cf83e1357eefb8bdf1542850d66d8007d620e4050b5715dc83f4a921d36ce9ce47d0d13c5d85f2b0ff8318d2877eec2f63b931bd47417a81a538327af927da3e

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

MD5
c0f972c5e033c0b4dc268a805cfa16a2

SHA1
a3f38579feb14d3b20289e453b41d88232145f68

SHA256
d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

SHA512
de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

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

MD5
c0f972c5e033c0b4dc268a805cfa16a2

SHA1
a3f38579feb14d3b20289e453b41d88232145f68

SHA256
d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

SHA512
de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

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

MD5
c0f972c5e033c0b4dc268a805cfa16a2

SHA1
a3f38579feb14d3b20289e453b41d88232145f68

SHA256
d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

SHA512
de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

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

MD5
c0f972c5e033c0b4dc268a805cfa16a2

SHA1
a3f38579feb14d3b20289e453b41d88232145f68

SHA256
d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

SHA512
de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

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

MD5
c0f972c5e033c0b4dc268a805cfa16a2

SHA1
a3f38579feb14d3b20289e453b41d88232145f68

SHA256
d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

SHA512
de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

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

MD5
c0f972c5e033c0b4dc268a805cfa16a2

SHA1
a3f38579feb14d3b20289e453b41d88232145f68

SHA256
d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

SHA512
de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

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

MD5
c0f972c5e033c0b4dc268a805cfa16a2

SHA1
a3f38579feb14d3b20289e453b41d88232145f68

SHA256
d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

SHA512
de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

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

MD5
c0f972c5e033c0b4dc268a805cfa16a2

SHA1
a3f38579feb14d3b20289e453b41d88232145f68

SHA256
d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

SHA512
de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

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

MD5
c0f972c5e033c0b4dc268a805cfa16a2

SHA1
a3f38579feb14d3b20289e453b41d88232145f68

SHA256
d8a0d25776c28e17e724da2b1c8fdae28d7c6b32cfa9d3d2a20f3f57ff370488

SHA512
de7803c4119355be7e06616abbfbf44b4ee23ba2caa987b630ad520126187c1f9eb2308f0ba5ba51cc8287fa75e5251d4e9d5ad940e8beb90b97f65d4890ca47

Download Submit
memory/888-67-0x0000000000000000-mapping.dmp

Download
memory/992-71-0x0000000000000000-mapping.dmp

Download
memory/1084-60-0x00000000752F1000-0x00000000752F3000-memory.dmp

Filesize
8KB

Download
memory/1472-74-0x0000000000000000-mapping.dmp

Download
memory/1480-73-0x0000000000000000-mapping.dmp

Download
memory/1544-63-0x0000000000000000-mapping.dmp

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