dcrat | a29a93f383f766d7764f2974c9a24414095768a44f76195d4e854203d364cba0

General

Target

a29a93f383f766d7764f2974c9a24414095768a44f76195d4e854203d364cba0.exe
Size

1.3MB
MD5

538b71c16a2ea9f6b97ab5b12f4572cf
SHA1

c76ad3f456045f9b174ef13d264e8e0a388e220e
SHA256

a29a93f383f766d7764f2974c9a24414095768a44f76195d4e854203d364cba0
SHA512

5b21a0db9fa80704e5653043d94de1a642db4820c121ae813ba1ada7f485d0fa0797bb1623300b7db75daca7b79a4cf8e94e1ebc3fe28a5517eeffba74c3f75e
SSDEEP

24576:U2G/nvxW3Ww0t6TnzGmVBDh4+aknuRRZJND0gFJ4rD/IjC:UbA30GnzV/q+DnsXg

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 12 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	4784	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4768	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3284	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4616	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2752	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3024	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2428	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2560	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1888	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3728	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3628	3812	schtasks.exe	16
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2372	3812	schtasks.exe	16

DCRat payload 5 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/files/0x0008000000022e50-137.dat	dcrat
behavioral1/files/0x0008000000022e50-138.dat	dcrat
behavioral1/memory/1976-139-0x0000000000BB0000-0x0000000000CC0000-memory.dmp	dcrat
behavioral1/files/0x0008000000022e5d-163.dat	dcrat
behavioral1/files/0x0008000000022e5d-164.dat	dcrat

Executes dropped EXE 2 IoCs

pid	Process
1976	DllCommonsvc.exe
3204	dllhost.exe

Checks computer location settings 2 TTPs 3 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-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	a29a93f383f766d7764f2974c9a24414095768a44f76195d4e854203d364cba0.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\Control Panel\International\Geo\Nation	DllCommonsvc.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs

Web Service
T1102

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Google\Update\Download\24dbde2999530e	DllCommonsvc.exe
File created	C:\Program Files (x86)\Windows Mail\dllhost.exe	DllCommonsvc.exe
File opened for modification	C:\Program Files (x86)\Windows Mail\dllhost.exe	DllCommonsvc.exe
File created	C:\Program Files (x86)\Windows Mail\5940a34987c991	DllCommonsvc.exe
File created	C:\Program Files (x86)\Google\Update\Download\WmiPrvSE.exe	DllCommonsvc.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\ModemLogs\69ddcba757bf72	DllCommonsvc.exe
File created	C:\Windows\ModemLogs\smss.exe	DllCommonsvc.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 12 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
4784	schtasks.exe
3284	schtasks.exe
3024	schtasks.exe
2560	schtasks.exe
1888	schtasks.exe
3728	schtasks.exe
3628	schtasks.exe
2372	schtasks.exe
4768	schtasks.exe
4616	schtasks.exe
2752	schtasks.exe
2428	schtasks.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000_Classes\Local Settings	a29a93f383f766d7764f2974c9a24414095768a44f76195d4e854203d364cba0.exe
Key created	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000_Classes\Local Settings	DllCommonsvc.exe

Suspicious behavior: EnumeratesProcesses 20 IoCs

pid	Process
1976	DllCommonsvc.exe
2360	powershell.exe
4372	powershell.exe
4380	powershell.exe
648	powershell.exe
2344	powershell.exe
2344	powershell.exe
2360	powershell.exe
4372	powershell.exe
4380	powershell.exe
648	powershell.exe
3204	dllhost.exe
3204	dllhost.exe
3204	dllhost.exe
3204	dllhost.exe
3204	dllhost.exe
3204	dllhost.exe
3204	dllhost.exe
3204	dllhost.exe
3204	dllhost.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3204	dllhost.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	1976	DllCommonsvc.exe
Token: SeDebugPrivilege	2360	powershell.exe
Token: SeDebugPrivilege	4372	powershell.exe
Token: SeDebugPrivilege	4380	powershell.exe
Token: SeDebugPrivilege	2344	powershell.exe
Token: SeDebugPrivilege	648	powershell.exe
Token: SeDebugPrivilege	3204	dllhost.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4572 wrote to memory of 5088	4572	a29a93f383f766d7764f2974c9a24414095768a44f76195d4e854203d364cba0.exe	80
PID 4572 wrote to memory of 5088	4572	a29a93f383f766d7764f2974c9a24414095768a44f76195d4e854203d364cba0.exe	80
PID 4572 wrote to memory of 5088	4572	a29a93f383f766d7764f2974c9a24414095768a44f76195d4e854203d364cba0.exe	80
PID 5088 wrote to memory of 2312	5088	WScript.exe	81
PID 5088 wrote to memory of 2312	5088	WScript.exe	81
PID 5088 wrote to memory of 2312	5088	WScript.exe	81
PID 2312 wrote to memory of 1976	2312	cmd.exe	83
PID 2312 wrote to memory of 1976	2312	cmd.exe	83
PID 1976 wrote to memory of 2344	1976	DllCommonsvc.exe	96
PID 1976 wrote to memory of 2344	1976	DllCommonsvc.exe	96
PID 1976 wrote to memory of 4380	1976	DllCommonsvc.exe	97
PID 1976 wrote to memory of 4380	1976	DllCommonsvc.exe	97
PID 1976 wrote to memory of 2360	1976	DllCommonsvc.exe	102
PID 1976 wrote to memory of 2360	1976	DllCommonsvc.exe	102
PID 1976 wrote to memory of 4372	1976	DllCommonsvc.exe	101
PID 1976 wrote to memory of 4372	1976	DllCommonsvc.exe	101
PID 1976 wrote to memory of 648	1976	DllCommonsvc.exe	100
PID 1976 wrote to memory of 648	1976	DllCommonsvc.exe	100
PID 1976 wrote to memory of 1304	1976	DllCommonsvc.exe	106
PID 1976 wrote to memory of 1304	1976	DllCommonsvc.exe	106
PID 1304 wrote to memory of 4480	1304	cmd.exe	108
PID 1304 wrote to memory of 4480	1304	cmd.exe	108
PID 1304 wrote to memory of 3204	1304	cmd.exe	109
PID 1304 wrote to memory of 3204	1304	cmd.exe	109

C:\Users\Admin\AppData\Local\Temp\a29a93f383f766d7764f2974c9a24414095768a44f76195d4e854203d364cba0.exe
"C:\Users\Admin\AppData\Local\Temp\a29a93f383f766d7764f2974c9a24414095768a44f76195d4e854203d364cba0.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:4572
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\providercommon\yTUdeXjbLOhnrN32dgrxVg.vbe"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:5088
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\providercommon\1zu9dW.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2312
  - - C:\providercommon\DllCommonsvc.exe
      "C:\providercommon\DllCommonsvc.exe"
      4⤵
      Executes dropped EXE
      Checks computer location settings
      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:1976
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\providercommon\DllCommonsvc.exe'
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2344
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Windows Mail\dllhost.exe'
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4380
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Users\Public\Pictures\OfficeClickToRun.exe'
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:648
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Windows\ModemLogs\smss.exe'
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:4372
    - - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
        
        "powershell" -Command Add-MpPreference -ExclusionPath 'C:\Program Files (x86)\Google\Update\Download\WmiPrvSE.exe'
        5⤵
        Suspicious behavior: EnumeratesProcesses
        Suspicious use of AdjustPrivilegeToken
        
        PID:2360
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Yt7RvnjQdj.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:1304
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:4480
      - C:\Program Files (x86)\Windows Mail\dllhost.exe
        
        "C:\Program Files (x86)\Windows Mail\dllhost.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:3204

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Windows Mail\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4784

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Mail\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4768

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Windows Mail\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3284

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Google\Update\Download\WmiPrvSE.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Program Files (x86)\Google\Update\Download\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2752

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "WmiPrvSEW" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Google\Update\Download\WmiPrvSE.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3024

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Windows\ModemLogs\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2428

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Windows\ModemLogs\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2560

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Windows\ModemLogs\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1888

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 6 /tr "'C:\Users\Public\Pictures\OfficeClickToRun.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3728

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Users\Public\Pictures\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3628

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 7 /tr "'C:\Users\Public\Pictures\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2372

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

Web Service

1

T1102

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Program Files (x86)\Windows Mail\dllhost.exe

Filesize
1.0MB

MD5
bd31e94b4143c4ce49c17d3af46bcad0

SHA1
f8c51ff3ff909531d9469d4ba1bbabae101853ff

SHA256
b5199d3eb28e7de8ec4a5de66cb339a03d90b297e2292473badaab98ade15c63

SHA512
f96658bd19b672fd84038bd7e95c89e14f4e6f84e3ce9c6fe3216861a41203406148c6a809c2ab350d0d6c5919c845f619deb1fc9b1f1814dfce87e566bc2394

Download Submit
C:\Program Files (x86)\Windows Mail\dllhost.exe

Filesize
1.0MB

MD5
bd31e94b4143c4ce49c17d3af46bcad0

SHA1
f8c51ff3ff909531d9469d4ba1bbabae101853ff

SHA256
b5199d3eb28e7de8ec4a5de66cb339a03d90b297e2292473badaab98ade15c63

SHA512
f96658bd19b672fd84038bd7e95c89e14f4e6f84e3ce9c6fe3216861a41203406148c6a809c2ab350d0d6c5919c845f619deb1fc9b1f1814dfce87e566bc2394

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Temp\Yt7RvnjQdj.bat

Filesize
212B

MD5
c1c913d377ba257472a74ddb5a489a25

SHA1
2ecdaa8f5178712954b110fbdb77a0b938ef3bac

SHA256
4ee44db2893f68843759ad065070feec00e79ad5e306eef8e81101adce29c287

SHA512
19d5db9d124809ca38b3d69da2ba82d0bb7c7d0bfde0896d417a4e4a3d8ef06d209837df595bd42b6098d876e07e95fc354165a8b134203079bcc9890dd26db5

Download Submit
C:\providercommon\1zu9dW.bat

Filesize
36B

MD5
6783c3ee07c7d151ceac57f1f9c8bed7

SHA1
17468f98f95bf504cc1f83c49e49a78526b3ea03

SHA256
8ab782f0f327a2021530e7230d3aee8abbecb7eed59482a3a46e78b9e3862322

SHA512
c6012d4bfac1ed14d0fd9f0eabd0e1c3d647b343db292a907b246271d52a4b7469c809db43910ddba2e8c5045f9cb3d24d0af62d363281e6cb8b39ee94a183e8

Download Submit
C:\providercommon\DllCommonsvc.exe

Filesize
1.0MB

MD5
bd31e94b4143c4ce49c17d3af46bcad0

SHA1
f8c51ff3ff909531d9469d4ba1bbabae101853ff

SHA256
b5199d3eb28e7de8ec4a5de66cb339a03d90b297e2292473badaab98ade15c63

SHA512
f96658bd19b672fd84038bd7e95c89e14f4e6f84e3ce9c6fe3216861a41203406148c6a809c2ab350d0d6c5919c845f619deb1fc9b1f1814dfce87e566bc2394

Download Submit
C:\providercommon\DllCommonsvc.exe

Filesize
1.0MB

MD5
bd31e94b4143c4ce49c17d3af46bcad0

SHA1
f8c51ff3ff909531d9469d4ba1bbabae101853ff

SHA256
b5199d3eb28e7de8ec4a5de66cb339a03d90b297e2292473badaab98ade15c63

SHA512
f96658bd19b672fd84038bd7e95c89e14f4e6f84e3ce9c6fe3216861a41203406148c6a809c2ab350d0d6c5919c845f619deb1fc9b1f1814dfce87e566bc2394

Download Submit
C:\providercommon\yTUdeXjbLOhnrN32dgrxVg.vbe

Filesize
197B

MD5
8088241160261560a02c84025d107592

SHA1
083121f7027557570994c9fc211df61730455bb5

SHA256
2072cc9a4a3b84d4c5178ab41c5588eea7d0103e3928e34d64f17bf97f3d1cc1

SHA512
20d9369dd359315848ea30144383a0bb479d86059fdbc3b3256ac84f998193512feb3b1799ab663619920c99fe7e0ebba33ada31a3855094b956fcd351c90478

Download Submit
memory/648-158-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/648-155-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/1976-140-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/1976-139-0x0000000000BB0000-0x0000000000CC0000-memory.dmp

Filesize
1.1MB

Download
memory/1976-148-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/2344-159-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/2344-153-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/2360-157-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/2360-151-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/2360-146-0x0000023D2F9C0000-0x0000023D2F9E2000-memory.dmp

Filesize
136KB

Download
memory/3204-165-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/3204-166-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/4372-160-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/4372-152-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/4380-161-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download
memory/4380-149-0x00007FF8173D0000-0x00007FF817E91000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v6

Replay Monitor

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Downloads