ryuk | b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d

General

Target

b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe
Size

121KB
MD5

6230b3044d91004700121402341d9bc6
SHA1

d98bd8631a432e1c5e5d091fd4085901a8935972
SHA256

b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d
SHA512

1a9afa17b70f5d6976cb61fadd418a6481ed605fb7813575ff02bad45099c1460933ffeafe60c6545a0fe1ca3943c32a0e7d668bb14093bc6520a5cace9373bd

Score

10^/10

ryuk ransomware

Malware Config

Extracted

Path

C:\users\Public\RyukReadMe.html

Family

ryuk

Ransom Note

contact balance of shadow universe Ryuk $password = 'HrP7O1qDZDw'; $torlink = 'http://oc6mkf4efqrjp2ue6qp6vmz4ofyjmlo6dtqiklqb2q546bnqeu66tbyd.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://oc6mkf4efqrjp2ue6qp6vmz4ofyjmlo6dtqiklqb2q546bnqeu66tbyd.onion

Signatures

Ryuk
Ransomware distributed via existing botnets, often Trickbot or Emotet.
ransomware ryuk
Executes dropped EXE 3 IoCs

Processes:

edrhVxxYJrep.exekhUwlpRHUlan.exeMhadIATDJlan.exe

pid process

2564 edrhVxxYJrep.exe
2068 khUwlpRHUlan.exe
3460 MhadIATDJlan.exe

pid	process
2564	edrhVxxYJrep.exe
2068	khUwlpRHUlan.exe
3460	MhadIATDJlan.exe

Checks computer location settings 2 TTPs 1 IoCs

Looks up country code configured in the registry, likely geofence.

Query Registry

T1012

System Information Discovery

T1082

Processes:

b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-790714498-1549421491-1643397139-1000\Control Panel\International\Geo\Nation	b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe

Drops file in Windows directory 2 IoCs

Processes:

svchost.exeTiWorker.exe

description	ioc	process
File opened for modification	C:\Windows\ServiceProfiles\NetworkService\AppData\Local\Microsoft\Windows\DeliveryOptimization\State\keyValueLKG.dat	svchost.exe
File opened for modification	C:\Windows\Logs\CBS\CBS.log	TiWorker.exe

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

System Information Discovery
T1082

Modifies data under HKEY_USERS 49 IoCs

Processes:

svchost.exe

description	ioc	process
Key created	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization	svchost.exe
Key created	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Settings	svchost.exe
Key created	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownloadMonthlyLinkLocalBytes = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownloadMonthlyCacheHostBytes = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\PeerInfoCount = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownlinkUsageBps = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\BkDownloadRatePct = "45"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\PriorityDownloadPendingCount = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\NormalDownloadCount = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\MemoryUsageKB = "4072"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config\DownloadMode_BackCompat = "1"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownloadMonthlyRateBkCnt = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\UplinkUsageBps = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\MemoryUsageKB = "4188"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\SwarmCount = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownloadMonthlyInternetBytes = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownloadMonthlyCdnBytes = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownloadMonthlyRateFrBps = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownloadMonthlyRateBkBps = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownlinkBps = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\FrDownloadRatePct = "90"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\PriorityDownloadCount = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\InternetConnectionCount = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\MonthlyUploadRestriction = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\UploadMonthlyInternetBytes = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownloadMonthlyLanBytes = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\MonthID = "2"	svchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config\GeoVersion_EndpointFullUri = "https://geover.prod.do.dsp.mp.microsoft.com/geoversion"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\LinkLocalConnectionCount = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\UplinkBps = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\UploadRatePct = "100"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\NormalDownloadPendingCount = "0"	svchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\CPUpct = "0.000000"	svchost.exe
Key created	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\SwarmCount = "1"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\LANConnectionCount = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\GroupConnectionCount = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\UploadCount = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config\KVFileExpirationTime = "132899765370056161"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\CDNConnectionCount = "0"	svchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\CPUpct = "1.071473"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config\DODownloadMode = "1"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\UploadMonthlyLanBytes = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownloadMonthlyGroupBytes = "0"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\DownloadMonthlyRateFrCnt = "0"	svchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Config\Geo_EndpointFullUri = "https://geo.prod.do.dsp.mp.microsoft.com/geo"	svchost.exe
Set value (int)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\CacheSizeBytes = "0"	svchost.exe
Set value (str)	\REGISTRY\USER\S-1-5-20\SOFTWARE\Microsoft\Windows\CurrentVersion\DeliveryOptimization\Usage\CPUpct = "0.366150"	svchost.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

Processes:

TiWorker.exe

description pid process

Token: SeSecurityPrivilege 1148 TiWorker.exe
Token: SeRestorePrivilege 1148 TiWorker.exe
Token: SeBackupPrivilege 1148 TiWorker.exe

description	pid	process
Token: SeSecurityPrivilege	1148	TiWorker.exe
Token: SeRestorePrivilege	1148	TiWorker.exe
Token: SeBackupPrivilege	1148	TiWorker.exe

Suspicious use of WriteProcessMemory 9 IoCs

Processes:

b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe

description	pid	process	target process
PID 544 wrote to memory of 2564	544	b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe	edrhVxxYJrep.exe
PID 544 wrote to memory of 2564	544	b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe	edrhVxxYJrep.exe
PID 544 wrote to memory of 2564	544	b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe	edrhVxxYJrep.exe
PID 544 wrote to memory of 2068	544	b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe	khUwlpRHUlan.exe
PID 544 wrote to memory of 2068	544	b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe	khUwlpRHUlan.exe
PID 544 wrote to memory of 2068	544	b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe	khUwlpRHUlan.exe
PID 544 wrote to memory of 3460	544	b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe	MhadIATDJlan.exe
PID 544 wrote to memory of 3460	544	b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe	MhadIATDJlan.exe
PID 544 wrote to memory of 3460	544	b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe	MhadIATDJlan.exe

C:\Users\Admin\AppData\Local\Temp\b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe
"C:\Users\Admin\AppData\Local\Temp\b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:544

C:\Users\Admin\AppData\Local\Temp\edrhVxxYJrep.exe
"C:\Users\Admin\AppData\Local\Temp\edrhVxxYJrep.exe" 9 REP
2⤵
- Executes dropped EXE
PID:2564

C:\Users\Admin\AppData\Local\Temp\khUwlpRHUlan.exe
"C:\Users\Admin\AppData\Local\Temp\khUwlpRHUlan.exe" 8 LAN
2⤵
- Executes dropped EXE
PID:2068

C:\Users\Admin\AppData\Local\Temp\MhadIATDJlan.exe
"C:\Users\Admin\AppData\Local\Temp\MhadIATDJlan.exe" 8 LAN
2⤵
- Executes dropped EXE
PID:3460

C:\Windows\System32\svchost.exe
C:\Windows\System32\svchost.exe -k NetworkService -p
1⤵
- Drops file in Windows directory
- Modifies data under HKEY_USERS
PID:460

C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe
C:\Windows\winsxs\amd64_microsoft-windows-servicingstack_31bf3856ad364e35_10.0.19041.1220_none_7e21bc567c7ed16b\TiWorker.exe -Embedding
1⤵
- Drops file in Windows directory
- Suspicious use of AdjustPrivilegeToken
PID:1148

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\MhadIATDJlan.exe
MD5
6230b3044d91004700121402341d9bc6

SHA1
d98bd8631a432e1c5e5d091fd4085901a8935972

SHA256
b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d

SHA512
1a9afa17b70f5d6976cb61fadd418a6481ed605fb7813575ff02bad45099c1460933ffeafe60c6545a0fe1ca3943c32a0e7d668bb14093bc6520a5cace9373bd

Download Submit
C:\Users\Admin\AppData\Local\Temp\MhadIATDJlan.exe
MD5
6230b3044d91004700121402341d9bc6

SHA1
d98bd8631a432e1c5e5d091fd4085901a8935972

SHA256
b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d

SHA512
1a9afa17b70f5d6976cb61fadd418a6481ed605fb7813575ff02bad45099c1460933ffeafe60c6545a0fe1ca3943c32a0e7d668bb14093bc6520a5cace9373bd

Download Submit
C:\Users\Admin\AppData\Local\Temp\edrhVxxYJrep.exe
MD5
6230b3044d91004700121402341d9bc6

SHA1
d98bd8631a432e1c5e5d091fd4085901a8935972

SHA256
b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d

SHA512
1a9afa17b70f5d6976cb61fadd418a6481ed605fb7813575ff02bad45099c1460933ffeafe60c6545a0fe1ca3943c32a0e7d668bb14093bc6520a5cace9373bd

Download Submit
C:\Users\Admin\AppData\Local\Temp\edrhVxxYJrep.exe
MD5
6230b3044d91004700121402341d9bc6

SHA1
d98bd8631a432e1c5e5d091fd4085901a8935972

SHA256
b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d

SHA512
1a9afa17b70f5d6976cb61fadd418a6481ed605fb7813575ff02bad45099c1460933ffeafe60c6545a0fe1ca3943c32a0e7d668bb14093bc6520a5cace9373bd

Download Submit
C:\Users\Admin\AppData\Local\Temp\khUwlpRHUlan.exe
MD5
6230b3044d91004700121402341d9bc6

SHA1
d98bd8631a432e1c5e5d091fd4085901a8935972

SHA256
b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d

SHA512
1a9afa17b70f5d6976cb61fadd418a6481ed605fb7813575ff02bad45099c1460933ffeafe60c6545a0fe1ca3943c32a0e7d668bb14093bc6520a5cace9373bd

Download Submit
C:\Users\Admin\AppData\Local\Temp\khUwlpRHUlan.exe
MD5
6230b3044d91004700121402341d9bc6

SHA1
d98bd8631a432e1c5e5d091fd4085901a8935972

SHA256
b53e77ab55abf1c7cc68a06e6260810948444cefe57b306febfed7e1f6c7619d

SHA512
1a9afa17b70f5d6976cb61fadd418a6481ed605fb7813575ff02bad45099c1460933ffeafe60c6545a0fe1ca3943c32a0e7d668bb14093bc6520a5cace9373bd

Download Submit
C:\users\Public\RyukReadMe.html
MD5
11b99d04340f1787b622f2bf871e3f7d

SHA1
ecae22838d8a43f0ec3bc99fc08e42df4301ebfe

SHA256
44e4c998f2fa1e1771a28098e5590750802680e9f16057d9ab36e0cbd7c1d334

SHA512
f917ef34e7fcbe7cb1f0da03862d43ab514c56a4886515d8363bceeda0c7c610244e4440888355ddf9f8c2182b6dae447ed3efd78dd39e421def8289230e8288

Download Submit

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads