dcrat | 6b4372f45d14a2f2b5d64d153e31b65436936921bceeeb8b01585f71a8c0e1bf

General

Target

6b4372f45d14a2f2b5d64d153e31b65436936921bceee.exe
Size

2.6MB
MD5

95a33349fd2a84e397b2f406d86ecf91
SHA1

aa12a73b3de5be31c77dac39d4d3a6a70269429f
SHA256

6b4372f45d14a2f2b5d64d153e31b65436936921bceeeb8b01585f71a8c0e1bf
SHA512

3fc5579a23da99e5ed41bd91bcbcf241a8cafb466bfa94d131ddc4f1d12c8d755361595d70e19e707d81f1d1ce5efc0e36b8579e47d9372f5da16a05b7c96ea1
SSDEEP

49152:0bB7GpqxgFuANb7UqRDIZ63KYV4JOU5/FZ53aqWVPVrNCddRrvawu:0bBSpeOuU7U4SC44U5DprauPu

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 17 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	420	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3504	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2548	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4924	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3112	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4156	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4476	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2952	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5012	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3484	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2032	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3672	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4816	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4104	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1300	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2056	4892	schtasks.exe	88
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5016	4892	schtasks.exe	88

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000c000000023b03-6.dat	dcrat
behavioral2/files/0x000a000000023b5b-25.dat	dcrat
behavioral2/memory/1664-28-0x0000000000F90000-0x00000000011E2000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 4 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-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	chainsavesref.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	6b4372f45d14a2f2b5d64d153e31b65436936921bceee.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	Install_JJSploit16.8.exe
Key value queried	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000\Control Panel\International\Geo\Nation	WScript.exe

Executes dropped EXE 3 IoCs

pid	Process
692	Install_JJSploit16.8.exe
1664	chainsavesref.exe
2776	RuntimeBroker.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe	chainsavesref.exe
File created	C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\9e8d7a4ca61bd9	chainsavesref.exe

Drops file in Windows directory 4 IoCs

description	ioc	Process
File created	C:\Windows\SKB\LanguageModels\5b884080fd4f94	chainsavesref.exe
File created	C:\Windows\Cursors\TextInputHost.exe	chainsavesref.exe
File created	C:\Windows\Cursors\22eafd247d37c3	chainsavesref.exe
File created	C:\Windows\SKB\LanguageModels\fontdrvhost.exe	chainsavesref.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	WScript.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	Install_JJSploit16.8.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WScript.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	chainsavesref.exe
Key created	\REGISTRY\USER\S-1-5-21-4089630652-1596403869-279772308-1000_Classes\Local Settings	Install_JJSploit16.8.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 18 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4156	schtasks.exe
2032	schtasks.exe
4104	schtasks.exe
1300	schtasks.exe
2056	schtasks.exe
5068	schtasks.exe
420	schtasks.exe
3112	schtasks.exe
4476	schtasks.exe
4816	schtasks.exe
3672	schtasks.exe
3484	schtasks.exe
5016	schtasks.exe
3504	schtasks.exe
2548	schtasks.exe
4924	schtasks.exe
2952	schtasks.exe
5012	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1664	chainsavesref.exe
1664	chainsavesref.exe
1664	chainsavesref.exe
1664	chainsavesref.exe
1664	chainsavesref.exe
2776	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1664	chainsavesref.exe
Token: SeDebugPrivilege	2776	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 1116 wrote to memory of 692	1116	6b4372f45d14a2f2b5d64d153e31b65436936921bceee.exe	82
PID 1116 wrote to memory of 692	1116	6b4372f45d14a2f2b5d64d153e31b65436936921bceee.exe	82
PID 1116 wrote to memory of 692	1116	6b4372f45d14a2f2b5d64d153e31b65436936921bceee.exe	82
PID 692 wrote to memory of 4136	692	Install_JJSploit16.8.exe	83
PID 692 wrote to memory of 4136	692	Install_JJSploit16.8.exe	83
PID 692 wrote to memory of 4136	692	Install_JJSploit16.8.exe	83
PID 692 wrote to memory of 3164	692	Install_JJSploit16.8.exe	84
PID 692 wrote to memory of 3164	692	Install_JJSploit16.8.exe	84
PID 692 wrote to memory of 3164	692	Install_JJSploit16.8.exe	84
PID 4136 wrote to memory of 4876	4136	WScript.exe	85
PID 4136 wrote to memory of 4876	4136	WScript.exe	85
PID 4136 wrote to memory of 4876	4136	WScript.exe	85
PID 4876 wrote to memory of 1664	4876	cmd.exe	87
PID 4876 wrote to memory of 1664	4876	cmd.exe	87
PID 1664 wrote to memory of 868	1664	chainsavesref.exe	107
PID 1664 wrote to memory of 868	1664	chainsavesref.exe	107
PID 868 wrote to memory of 640	868	cmd.exe	109
PID 868 wrote to memory of 640	868	cmd.exe	109
PID 868 wrote to memory of 2776	868	cmd.exe	113
PID 868 wrote to memory of 2776	868	cmd.exe	113

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\6b4372f45d14a2f2b5d64d153e31b65436936921bceee.exe
"C:\Users\Admin\AppData\Local\Temp\6b4372f45d14a2f2b5d64d153e31b65436936921bceee.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1116
- C:\Users\Admin\AppData\Roaming\Install_JJSploit16.8.exe
  "C:\Users\Admin\AppData\Roaming\Install_JJSploit16.8.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Modifies registry class
  - Suspicious use of WriteProcessMemory
  PID:692
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Runtimehost\MYWzp0a6xwrEK5S4UF.vbe"
    3⤵
    - Checks computer location settings
    - System Location Discovery: System Language Discovery
    - Suspicious use of WriteProcessMemory
    PID:4136
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Runtimehost\pQImPX9m1y2f8C.bat" "
      4⤵
      System Location Discovery: System Language Discovery
      Suspicious use of WriteProcessMemory
      PID:4876
    - - C:\Runtimehost\chainsavesref.exe
        
        "C:\Runtimehost\chainsavesref.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:1664
      - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\QLNjhu5Rlm.bat"
        6⤵
        Suspicious use of WriteProcessMemory
        
        PID:868
        
        C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        7⤵
        
        PID:640
        
        C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe
        
        "C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe"
        7⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2776
- - C:\Windows\SysWOW64\WScript.exe
    "C:\Windows\System32\WScript.exe" "C:\Runtimehost\file.vbs"
    3⤵
    - System Location Discovery: System Language Discovery
    PID:3164

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 8 /tr "'C:\Users\Public\sihost.exe'" /f
1⤵
- Scheduled Task/Job: Scheduled Task
PID:5068

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Users\Public\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 10 /tr "'C:\Users\Public\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:420

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wscriptw" /sc MINUTE /mo 7 /tr "'C:\Users\Default User\wscript.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2548

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wscript" /sc ONLOGON /tr "'C:\Users\Default User\wscript.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4924

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wscriptw" /sc MINUTE /mo 8 /tr "'C:\Users\Default User\wscript.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3112

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 6 /tr "'C:\Runtimehost\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4156

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Runtimehost\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4476

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Runtimehost\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2952

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3484

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\1.3.147.37\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2032

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 5 /tr "'C:\Windows\SKB\LanguageModels\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3672

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\SKB\LanguageModels\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4104

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 8 /tr "'C:\Windows\SKB\LanguageModels\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4816

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 12 /tr "'C:\Windows\Cursors\TextInputHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5016

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHost" /sc ONLOGON /tr "'C:\Windows\Cursors\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2056

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "TextInputHostT" /sc MINUTE /mo 7 /tr "'C:\Windows\Cursors\TextInputHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1300

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

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Runtimehost\MYWzp0a6xwrEK5S4UF.vbe

Filesize
202B

MD5
ecf0d0693e7b19616fab6c1923ce1bca

SHA1
11a4d520d950f72c8575faf33e15037e68d36712

SHA256
4b3af66a1c0ed2ef1bf7b55ca6940cada614229200dae62024b03c08b7f843d6

SHA512
a8503afbcc63814c567d666c81b8428c2cd00709c89346e1570c065922ebc014fc296663cc3131148a58f4344a45f1142851aa0ed2754b21445912accf05341f

Download Submit
C:\Runtimehost\chainsavesref.exe

Filesize
2.3MB

MD5
afc7c278c420c1c025a97af636a4f6cd

SHA1
d5af2fd0336518756ee300dd4fb5106959adcaf7

SHA256
f817634c1236f507c749742bd1bae393b74d2d29620128ecc50037205f175cc7

SHA512
12a401f94aa941e56e116c9981626b50d18e592b1550ff5198fef47895a43a56fcbe77f6e88cd8951d01e7c05a4a6d80ce54176257ec47c9a219b1dece62337a

Download Submit
C:\Runtimehost\file.vbs

Filesize
34B

MD5
677cc4360477c72cb0ce00406a949c61

SHA1
b679e8c3427f6c5fc47c8ac46cd0e56c9424de05

SHA256
f1cccb5ae4aa51d293bd3c7d2a1a04cb7847d22c5db8e05ac64e9a6d7455aa0b

SHA512
7cfe2cc92f9e659f0a15a295624d611b3363bd01eb5bcf9bc7681ea9b70b0564d192d570d294657c8dc2c93497fa3b4526c975a9bf35d69617c31d9936573c6a

Download Submit
C:\Runtimehost\pQImPX9m1y2f8C.bat

Filesize
34B

MD5
315845ba3d99cbfaeec438a8dddee9ae

SHA1
9b210d6f805af769de23ae060844a1dddcf9cdce

SHA256
704a1a651e6b566a4a0e54d95de33d5c55a330d75c0b4456b3fa4c2ba4718a97

SHA512
3b5a0364038167ac3133f43f9eb6b85090612a30c27ab3920adc8c18a4a7fc8eb030378819dd9be98227ae668dcdf5779d9feb5993d99e9b02de57bf5622cbc7

Download Submit
C:\Users\Admin\AppData\Local\Temp\QLNjhu5Rlm.bat

Filesize
240B

MD5
1218db6605fd935a5c2cb03d98b90cc4

SHA1
e20f2602f9803a524e4eae22d4f68882172a162a

SHA256
6cfd761b2be81c69ccf9e337cdc40002dc847ce7063a0380b8ead3f1da109f51

SHA512
4ae4cea6c80aadc8658771b81a8192876e383ee8d71de34c23de675a24d815284611e7ead9f8b524b9b78ae4b1f71f3b8efd538c7222ccb02ad22b87aaf8c690

Download Submit
C:\Users\Admin\AppData\Roaming\Install_JJSploit16.8.exe

Filesize
2.6MB

MD5
1d3f70e65723398ca3ffefd0f346ef0e

SHA1
40c6926b7abbfaab25806f6e9bb88e9f52c87007

SHA256
50d21266acc179352743c1bf14ada681f4f6517ed240ac1ded4f094a1248a95c

SHA512
02044791a8e8b40625bebd7ea902066222ed00d94065a22b5d8ac39d539e5295d5345259f9fabdc6c2a3c95579e978fe8914f6c1fe640b5a2869082499a57d6d

Download Submit
memory/1116-0-0x00007FFDF20F3000-0x00007FFDF20F5000-memory.dmp

Filesize
8KB

Download
memory/1116-1-0x0000000000BF0000-0x0000000000E94000-memory.dmp

Filesize
2.6MB

Download
memory/1664-32-0x000000001C350000-0x000000001C3A6000-memory.dmp

Filesize
344KB

Download
memory/1664-31-0x000000001BD00000-0x000000001BD16000-memory.dmp

Filesize
88KB

Download
memory/1664-30-0x000000001C3A0000-0x000000001C3F0000-memory.dmp

Filesize
320KB

Download
memory/1664-29-0x000000001BCE0000-0x000000001BCFC000-memory.dmp

Filesize
112KB

Download
memory/1664-33-0x000000001BD20000-0x000000001BD32000-memory.dmp

Filesize
72KB

Download
memory/1664-37-0x000000001C430000-0x000000001C438000-memory.dmp

Filesize
32KB

Download
memory/1664-36-0x000000001C420000-0x000000001C428000-memory.dmp

Filesize
32KB

Download
memory/1664-35-0x000000001C410000-0x000000001C41E000-memory.dmp

Filesize
56KB

Download
memory/1664-34-0x000000001CC70000-0x000000001D198000-memory.dmp

Filesize
5.2MB

Download
memory/1664-28-0x0000000000F90000-0x00000000011E2000-memory.dmp

Filesize
2.3MB

Download
memory/2776-59-0x000000001D5A0000-0x000000001D5F6000-memory.dmp

Filesize
344KB

Download
memory/2776-60-0x000000001D5F0000-0x000000001D602000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads