dcrat | 851ec341760139a4b59c5a07388b975d0b1f508eef8d5c3a9e2ec64f3ef4a16c

General

Target
18e2fbc204f190723b7baf77a35752c3.exe
Size 2.8MB
Sample221021-we54eahddp
SHA256 851ec341760139a4b59c5a07388b975d0b1f508eef8d5c3a9e2ec64f3ef4a16c
MD5 18e2fbc204f190723b7baf77a35752c3
SHA1 1f0463085088cf2afe2eb8197caf0a74738782ad
SHA512 a41e3dcf42268cab4f91ceb9677a9720ac1b97fe2cc3c1795ca0546edcd98a2132cb7e0087f2ea63a7ebe142c25b2c3c7eb8c14ffc74a0a418962c63de647b7c
SSDEEP 49152:Z6isctL3DxiZWjU81PnUxfRkj4RjZT8iw9zeADpewwwUqr8N:Z6JMLFQX8uxfRkjoC9zpdewwxrN
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

dcrat infostealer rat

Malware Config

Signatures

DcRat
DarkCrystal(DC) is a new .NET RAT active since June 2019 capable of loading additional plugins.
rat infostealer dcrat

Process spawned unexpected child process 15 IoCs

This typically indicates the parent process was compromised via an exploit or macro.

description	pid	pid_target	Process	procid_target
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4744	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4668	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4636	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3820	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3420	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4036	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2352	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1392	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4348	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3268	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3368	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4644	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1512	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4476	3932	schtasks.exe	20
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4032	3932	schtasks.exe	20

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/3052-132-0x0000000000490000-0x000000000075A000-memory.dmp	dcrat
behavioral2/files/0x0006000000022e18-139.dat	dcrat
behavioral2/files/0x0006000000022e18-140.dat	dcrat

Executes dropped EXE 1 IoCs

pid	Process
228	sihost.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

description	ioc	Process
Key value queried	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000\Control Panel\International\Geo\Nation	18e2fbc204f190723b7baf77a35752c3.exe

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Windows Portable Devices\sihost.exe	18e2fbc204f190723b7baf77a35752c3.exe
File created	C:\Program Files (x86)\Windows Portable Devices\66fc9ff0ee96c2	18e2fbc204f190723b7baf77a35752c3.exe
File created	C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\SearchApp.exe	18e2fbc204f190723b7baf77a35752c3.exe
File created	C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\38384e6a620884	18e2fbc204f190723b7baf77a35752c3.exe
File created	C:\Program Files (x86)\Google\Update\backgroundTaskHost.exe	18e2fbc204f190723b7baf77a35752c3.exe
File created	C:\Program Files (x86)\Google\Update\eddb19405b7ce1	18e2fbc204f190723b7baf77a35752c3.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 15 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task

T1053

pid	Process
4636	schtasks.exe
3820	schtasks.exe
1392	schtasks.exe
4348	schtasks.exe
3268	schtasks.exe
4644	schtasks.exe
4476	schtasks.exe
4744	schtasks.exe
3420	schtasks.exe
2352	schtasks.exe
3368	schtasks.exe
4032	schtasks.exe
4668	schtasks.exe
4036	schtasks.exe
1512	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2629973501-4017243118-3254762364-1000_Classes\Local Settings	18e2fbc204f190723b7baf77a35752c3.exe

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
3052	18e2fbc204f190723b7baf77a35752c3.exe
3052	18e2fbc204f190723b7baf77a35752c3.exe
3052	18e2fbc204f190723b7baf77a35752c3.exe
3052	18e2fbc204f190723b7baf77a35752c3.exe
3052	18e2fbc204f190723b7baf77a35752c3.exe
3052	18e2fbc204f190723b7baf77a35752c3.exe
3052	18e2fbc204f190723b7baf77a35752c3.exe
3052	18e2fbc204f190723b7baf77a35752c3.exe
3052	18e2fbc204f190723b7baf77a35752c3.exe
3052	18e2fbc204f190723b7baf77a35752c3.exe
228	sihost.exe
228	sihost.exe
228	sihost.exe
228	sihost.exe
228	sihost.exe
228	sihost.exe
228	sihost.exe
228	sihost.exe
228	sihost.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
228	sihost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3052	18e2fbc204f190723b7baf77a35752c3.exe
Token: SeDebugPrivilege	228	sihost.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3052 wrote to memory of 1144	3052	18e2fbc204f190723b7baf77a35752c3.exe	98
PID 3052 wrote to memory of 1144	3052	18e2fbc204f190723b7baf77a35752c3.exe	98
PID 1144 wrote to memory of 3448	1144	cmd.exe	100
PID 1144 wrote to memory of 3448	1144	cmd.exe	100
PID 1144 wrote to memory of 228	1144	cmd.exe	101
PID 1144 wrote to memory of 228	1144	cmd.exe	101

C:\Users\Admin\AppData\Local\Temp\18e2fbc204f190723b7baf77a35752c3.exe
"C:\Users\Admin\AppData\Local\Temp\18e2fbc204f190723b7baf77a35752c3.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3052
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\rxc6Z07b4w.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1144
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:3448
- - C:\Program Files (x86)\Windows Portable Devices\sihost.exe
    "C:\Program Files (x86)\Windows Portable Devices\sihost.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    PID:228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 9 /tr "'C:\Users\All Users\Desktop\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4744

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Users\All Users\Desktop\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4668

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 7 /tr "'C:\Users\All Users\Desktop\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4636

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\SearchApp.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3820

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchApp" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3420

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SearchAppS" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\SearchApp.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4036

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Google\Update\backgroundTaskHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2352

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Program Files (x86)\Google\Update\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1392

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Google\Update\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4348

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Windows Portable Devices\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3268

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Portable Devices\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3368

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Portable Devices\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4644

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1512

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4032

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

sihost.exe

Path C:\Program Files (x86)\Windows Portable Devices\sihost.exe
Size 2.8MB
SHA256 851ec341760139a4b59c5a07388b975d0b1f508eef8d5c3a9e2ec64f3ef4a16c
MD5 18e2fbc204f190723b7baf77a35752c3
SHA1 1f0463085088cf2afe2eb8197caf0a74738782ad
SHA512 a41e3dcf42268cab4f91ceb9677a9720ac1b97fe2cc3c1795ca0546edcd98a2132cb7e0087f2ea63a7ebe142c25b2c3c7eb8c14ffc74a0a418962c63de647b7c
SSDEEP 49152:Z6isctL3DxiZWjU81PnUxfRkj4RjZT8iw9zeADpewwwUqr8N:Z6JMLFQX8uxfRkjoC9zpdewwxrN
MD5 SHA1 SHA512 SSDEEP

Submit Download

sihost.exe

Path C:\Program Files (x86)\Windows Portable Devices\sihost.exe
Size 2.8MB
SHA256 851ec341760139a4b59c5a07388b975d0b1f508eef8d5c3a9e2ec64f3ef4a16c
MD5 18e2fbc204f190723b7baf77a35752c3
SHA1 1f0463085088cf2afe2eb8197caf0a74738782ad
SHA512 a41e3dcf42268cab4f91ceb9677a9720ac1b97fe2cc3c1795ca0546edcd98a2132cb7e0087f2ea63a7ebe142c25b2c3c7eb8c14ffc74a0a418962c63de647b7c
SSDEEP 49152:Z6isctL3DxiZWjU81PnUxfRkj4RjZT8iw9zeADpewwwUqr8N:Z6JMLFQX8uxfRkjoC9zpdewwxrN
MD5 SHA1 SHA512 SSDEEP

Submit Download

rxc6Z07b4w.bat

Path C:\Users\Admin\AppData\Local\Temp\rxc6Z07b4w.bat
Size 223B
SHA256 136ee225644113d8fe4c8d9d4fa4184fc0be0b99e539a2750529b6e94b340832
MD5 d990bbe391a822c3496d0f5ad0168e22
SHA1 a46eab1647a9118d4040cfe9b791321149afa39e
SHA512 62e1f09c95f0216bf6ba28e31da4095ea027eca219e9b8f4e209305d74e1766d3ca6b10daf0fbb273b66eaa6e763ee66cd444e1d803e25ecf614eb845f0d6224
MD5 SHA1 SHA512

Submit Download

memory/228-141-0x00007FFEE77D0000-0x00007FFEE8291000-memory.dmp

Download

memory/228-142-0x00007FFEE77D0000-0x00007FFEE8291000-memory.dmp

Download

memory/3052-132-0x0000000000490000-0x000000000075A000-memory.dmp

Download

memory/3052-133-0x00007FFEE8520000-0x00007FFEE8FE1000-memory.dmp

Download

memory/3052-137-0x00007FFEE8520000-0x00007FFEE8FE1000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

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Downloads