dcrat | 4944035addbf7b1db7cf58fca9cda3050fbf87c3b5ca18dc124ceae5767a8bea

General

Target

74f1fcf96c9e31f50f6d83072ec68d07.exe
Size

19KB
MD5

74f1fcf96c9e31f50f6d83072ec68d07
SHA1

f05ada88e038fef51b6f0840084cd0f155faaa0e
SHA256

4944035addbf7b1db7cf58fca9cda3050fbf87c3b5ca18dc124ceae5767a8bea
SHA512

2816798078e430930c77c7d992924a07159dea089d1462bc17833b197545af5eebbaecca23869b1b880128bf82c4a0ab815c490c7a08ca6ed7e48099ef479074
SSDEEP

384:uJMu1ZUZebwYr/lfbX6b+f9daNutwoLmdKkd/rwmW:E11Zzb1bQ+fXaNOST/rU

Score

10^/10

dcrat discovery 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
Dcrat family
dcrat

Process spawned unexpected child process 9 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	1664	2672	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3648	2672	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2228	2672	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	464	2672	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3140	2672	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4444	2672	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4656	2672	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3308	2672	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3632	2672	schtasks.exe	88

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000a000000023c08-7.dat	dcrat
behavioral2/files/0x0007000000023cb0-23.dat	dcrat
behavioral2/memory/4316-25-0x0000000000D50000-0x0000000000E32000-memory.dmp	dcrat

Downloads MZ/PE file

Checks computer location settings 2 TTPs 5 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-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	WinLatency.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	services.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	74f1fcf96c9e31f50f6d83072ec68d07.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	524epqpo.kt3.exe
Key value queried	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 3 IoCs

pid	Process
2664	524epqpo.kt3.exe
4316	WinLatency.exe
4236	services.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
1	raw.githubusercontent.com
2	raw.githubusercontent.com

Drops file in Program Files directory 4 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Windows Defender\uk-UA\fontdrvhost.exe	WinLatency.exe
File opened for modification	C:\Program Files (x86)\Windows Defender\uk-UA\fontdrvhost.exe	WinLatency.exe
File created	C:\Program Files (x86)\Windows Defender\uk-UA\5b884080fd4f94	WinLatency.exe
File created	C:\Program Files\WindowsApps\Microsoft.MicrosoftStickyNotes_3.6.73.0_neutral_split.scale-100_8wekyb3d8bbwe\microsoft.system.package.metadata\sppsvc.exe	WinLatency.exe

Drops file in Windows directory 1 IoCs

description	ioc	Process
File created	C:\Windows\schemas\EAPMethods\upfc.exe	WinLatency.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 4 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	74f1fcf96c9e31f50f6d83072ec68d07.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	524epqpo.kt3.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe

Modifies registry class 3 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	WinLatency.exe
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	services.exe
Key created	\REGISTRY\USER\S-1-5-21-3756129449-3121373848-4276368241-1000_Classes\Local Settings	524epqpo.kt3.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 9 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
464	schtasks.exe
4444	schtasks.exe
2228	schtasks.exe
3648	schtasks.exe
3140	schtasks.exe
4656	schtasks.exe
3308	schtasks.exe
3632	schtasks.exe
1664	schtasks.exe

Suspicious behavior: EnumeratesProcesses 10 IoCs

pid	Process
4316	WinLatency.exe
4236	services.exe
4236	services.exe
4236	services.exe
4236	services.exe
4236	services.exe
4236	services.exe
4236	services.exe
4236	services.exe
4236	services.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
4236	services.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1124	74f1fcf96c9e31f50f6d83072ec68d07.exe
Token: SeDebugPrivilege	4316	WinLatency.exe
Token: SeDebugPrivilege	4236	services.exe

Suspicious use of WriteProcessMemory 21 IoCs

description	pid	Process	procid_target
PID 1124 wrote to memory of 2664	1124	74f1fcf96c9e31f50f6d83072ec68d07.exe	83
PID 1124 wrote to memory of 2664	1124	74f1fcf96c9e31f50f6d83072ec68d07.exe	83
PID 1124 wrote to memory of 2664	1124	74f1fcf96c9e31f50f6d83072ec68d07.exe	83
PID 2664 wrote to memory of 5028	2664	524epqpo.kt3.exe	84
PID 2664 wrote to memory of 5028	2664	524epqpo.kt3.exe	84
PID 2664 wrote to memory of 5028	2664	524epqpo.kt3.exe	84
PID 5028 wrote to memory of 2292	5028	WScript.exe	85
PID 5028 wrote to memory of 2292	5028	WScript.exe	85
PID 5028 wrote to memory of 2292	5028	WScript.exe	85
PID 2292 wrote to memory of 4316	2292	cmd.exe	87
PID 2292 wrote to memory of 4316	2292	cmd.exe	87
PID 4316 wrote to memory of 3764	4316	WinLatency.exe	98
PID 4316 wrote to memory of 3764	4316	WinLatency.exe	98
PID 3764 wrote to memory of 1468	3764	cmd.exe	100
PID 3764 wrote to memory of 1468	3764	cmd.exe	100
PID 3764 wrote to memory of 4236	3764	cmd.exe	104
PID 3764 wrote to memory of 4236	3764	cmd.exe	104
PID 4236 wrote to memory of 3872	4236	services.exe	105
PID 4236 wrote to memory of 3872	4236	services.exe	105
PID 4236 wrote to memory of 4176	4236	services.exe	106
PID 4236 wrote to memory of 4176	4236	services.exe	106

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\74f1fcf96c9e31f50f6d83072ec68d07.exe
"C:\Users\Admin\AppData\Local\Temp\74f1fcf96c9e31f50f6d83072ec68d07.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1124
- C:\Users\Admin\AppData\Local\Temp\524epqpo.kt3.exe
  "C:\Users\Admin\AppData\Local\Temp\524epqpo.kt3.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:2664
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\WinSattl\H4iFvhalfT9t12Rug.vbe"
    3⤵
    - Checks computer location settings
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:5028
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\WinSattl\9Jks4Q9248ljrax16iPG1ojfLKPqxh.bat" "
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:2292
    - - C:\Users\Admin\AppData\Local\Temp\WinSattl\WinLatency.exe
        
        "C:\Users\Admin\AppData\Local\Temp\WinSattl\WinLatency.exe"
        5⤵
        Checks computer location settings
        Executes dropped EXE
        Drops file in Program Files directory
        Drops file in Windows directory
        Modifies registry class
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:4316
      - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Pt8gFqtdhd.bat"
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:3764
        
        C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        7⤵
        
        PID:1468
        
        C:\Recovery\WindowsRE\services.exe
        
        "C:\Recovery\WindowsRE\services.exe"
        7⤵
        Checks computer location settings
        Executes dropped EXE
        Modifies registry class
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        Suspicious use of WriteProcessMemory
        
        PID:4236
        
        C:\Windows\System32\WScript.exe
        
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\810a4d90-51bf-4ebd-9b27-8ebeafc74393.vbs"
        8⤵
        
        PID:3872
        
        C:\Windows\System32\WScript.exe
        
        "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\f3a03ebe-72ed-4508-9423-21268d18f2fc.vbs"
        8⤵
        
        PID:4176

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Defender\uk-UA\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1664

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Defender\uk-UA\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3648

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 10 /tr "'C:\Program Files (x86)\Windows Defender\uk-UA\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\services.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:464

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "services" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3140

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "servicess" /sc MINUTE /mo 13 /tr "'C:\Recovery\WindowsRE\services.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4444

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\conhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4656

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3308

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "conhostc" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\conhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3632

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\524epqpo.kt3.exe

Filesize
1.2MB

MD5
24ab440ae1ee72bb5abb8c40dbc4ff4c

SHA1
3f2331bcebb4bda4a9ecf80f448112c044af0aa7

SHA256
b9f480785e10ba5dfc0cc4975393f93f00de372e77d667c4be323c7da20c6841

SHA512
2b48f5cf2622f3db2010c21df840b4382b6bfbd3ff83e7f0fe6ac7a3f3374054df29b77183d8fed10113928fd2f2abd64a2966f8d714de983759b5d33ecdc62e

Download Submit
C:\Users\Admin\AppData\Local\Temp\810a4d90-51bf-4ebd-9b27-8ebeafc74393.vbs

Filesize
710B

MD5
4980d6a4051bcda13983986463846788

SHA1
cc86262c92efb8fd059abc08bda96553b7e1d70d

SHA256
c474e077a27a30979ca03d1b4ee4da7ae9a662ad0a80973a86cb34b797369a14

SHA512
4bec7a4c8cdcecb9d179ed95f7b2e302fb7d8b3b363a37337ba96bf47bca936ad5de0713f2e3dfca0bb640dcbf80a13945662c2f2247727131010f1c9dd29dcc

Download Submit
C:\Users\Admin\AppData\Local\Temp\Pt8gFqtdhd.bat

Filesize
199B

MD5
2d563b946131580bcd027cd6a2c8d8de

SHA1
7890b48a5a48d4b6b96d21b538abb052f9fd6867

SHA256
b5aad8ad0d76932ed98e62edf0a403aec4f82ab5a2c6c44e513898bf24b44e1d

SHA512
aeef40d01a86d6401e333c78a579d7e7616f28284083fd43d73b3ebedc569746bb5e2ed646ae4ca540dbdfcadf0dc6fee99d8bdef20abb399d191f218ce512c6

Download Submit
C:\Users\Admin\AppData\Local\Temp\WinSattl\9Jks4Q9248ljrax16iPG1ojfLKPqxh.bat

Filesize
32B

MD5
379e341777be6ff907435c23e8820088

SHA1
e14dd5b865c6b697c2a76ba49ac90a1b98986bb0

SHA256
c63d7ef8bbd2e8fa2c18fc52fbef8150ea31bd89e0f793a08f60b0468ed50df6

SHA512
df6551d2719418fe3b1f564d59139cf67e5b3a878a3179dbd6fca90d699646e18817bbe62ccba456cbe5d8c67ee9b493abfc85afbaf36a9846bf79dbdf9b2738

Download Submit
C:\Users\Admin\AppData\Local\Temp\WinSattl\H4iFvhalfT9t12Rug.vbe

Filesize
219B

MD5
7e92ca966c14c0e729731a0afa60e5c2

SHA1
ae5c63fa752839a794e46112cd780120f352ee71

SHA256
acd2acbb0fd9b50b061a8252f85f8e2ebba9f32a1f74d157b5061e6e7ceed384

SHA512
aab41b66c085dfb53b472bd8ef3b987b667df6c8f819396aec44f99cfbb20731f6e90b931eb3d5c2c1eb0d9c7ee0bec5465536c3397f6f0b90c719dfc694a715

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

Filesize
872KB

MD5
b26ea50de8f1da57b78e045ec904e19a

SHA1
8137c1fe0633482dd4c42bf2abb7c3b042877e38

SHA256
78fee25cc75affb005b5ca205328f5e0e44ba153e018fad0a7720c96940f5b9f

SHA512
29b76a3a8cb0435013e46198bab2755f3de84473cfc8a8b3d26dd3e2b05eec0bb1409e9cb43235d4fd6bbe5d30c1978f58acba89d9172e575d94262dc11d1ffe

Download Submit
C:\Users\Admin\AppData\Local\Temp\f3a03ebe-72ed-4508-9423-21268d18f2fc.vbs

Filesize
486B

MD5
417b8c10024f7682dd74f84a6c47d3fb

SHA1
868a5265392995633849c2007a581021fde79e75

SHA256
46a529a4e658c15e0d2a6d0b332f3c50b37d1fcab37b5c39b25e9cebe1488c1d

SHA512
f79024f6b591d57045707e7c7e24c0d429913c242f5a58ac19c4aab94b6752ddc07d4d1995d01d103ad79b2f399b06414fdc49141f7f856bbfd981c48cc26cac

Download Submit
memory/1124-11-0x00000000748E0000-0x0000000075090000-memory.dmp

Filesize
7.7MB

Download
memory/1124-0-0x00000000748EE000-0x00000000748EF000-memory.dmp

Filesize
4KB

Download
memory/1124-2-0x00000000748E0000-0x0000000075090000-memory.dmp

Filesize
7.7MB

Download
memory/1124-1-0x0000000000110000-0x000000000011E000-memory.dmp

Filesize
56KB

Download
memory/4316-25-0x0000000000D50000-0x0000000000E32000-memory.dmp

Filesize
904KB

Download
memory/4316-26-0x0000000002EB0000-0x0000000002EB8000-memory.dmp

Filesize
32KB

Download
memory/4316-27-0x0000000002ED0000-0x0000000002EDA000-memory.dmp

Filesize
40KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads