dcrat | 51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2

General

Target

51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
Size

413KB
MD5

d42e209f293b2f4551ca20bbfaf685bf
SHA1

5e77d2a5933e32b57ef96464e94d4a2b692f6421
SHA256

51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2
SHA512

62580c3a1524d46c907b6c040d20bb67dbf375bc5c9fb0452bdadb30f21e42b9c1e40f0176ebd6eb437f2f7f47825398febaa147f0cb4459c2b19dbd011d0787
SSDEEP

12288:XQndjOJNp/0+fS4qVleduxRTP42SgJ3H+DEqn:AndjOJbjS4qVleduxRTP42SgBb+

Score

10^/10

dcrat infostealer persistence 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 payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral2/memory/2268-132-0x0000020171EE0000-0x0000020171F4E000-memory.dmp	dcrat
C:\ProgramData\Microsoft\MF\WmiPrvSE.exe	dcrat
C:\ProgramData\Microsoft\MF\WmiPrvSE.exe	dcrat

Executes dropped EXE 1 IoCs

Processes:

WmiPrvSE.exe

pid process

4436 WmiPrvSE.exe

pid	process
4436	WmiPrvSE.exe

Adds Run key to start application 2 TTPs 6 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\fontdrvhost = "\"C:\\Program Files\\Mozilla Firefox\\gmp-clearkey\\0.1\\fontdrvhost.exe\""	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\upfc = "\"C:\\Documents and Settings\\upfc.exe\""	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\System = "\"C:\\Documents and Settings\\System.exe\""	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\csrss = "\"C:\\Program Files\\Windows Photo Viewer\\en-US\\csrss.exe\""	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\WmiPrvSE = "\"C:\\ProgramData\\Microsoft\\MF\\WmiPrvSE.exe\""	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
Set value (str)	\REGISTRY\USER\S-1-5-21-2295526160-1155304984-640977766-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\SppExtComObj = "\"C:\\Recovery\\WindowsRE\\SppExtComObj.exe\""	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe

Drops file in Program Files directory 4 IoCs

Processes:

51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe

description	ioc	process
File created	C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\fontdrvhost.exe	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
File created	C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\5b884080fd4f94e2695da25c503f9e33b9605b83	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
File created	C:\Program Files\Windows Photo Viewer\en-US\csrss.exe	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
File created	C:\Program Files\Windows Photo Viewer\en-US\886983d96e3d3e31032c679b2d4ea91b6c05afef	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe

Creates scheduled task(s) 1 TTPs 6 IoCs
Schtasks is often used by malware for persistence or to perform post-infection execution.
persistence

Scheduled Task
T1053

Processes:

schtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exeschtasks.exe

pid process

3732 schtasks.exe
4792 schtasks.exe
4236 schtasks.exe
4788 schtasks.exe
1500 schtasks.exe
1344 schtasks.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exeWmiPrvSE.exe

pid process

2268 51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
4436 WmiPrvSE.exe

pid	process
3732	schtasks.exe
4792	schtasks.exe
4236	schtasks.exe
4788	schtasks.exe
1500	schtasks.exe
1344	schtasks.exe

pid	process
2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
4436	WmiPrvSE.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exeWmiPrvSE.exe

description	pid	process
Token: SeDebugPrivilege	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
Token: SeDebugPrivilege	4436	WmiPrvSE.exe

Suspicious use of WriteProcessMemory 14 IoCs

Processes:

51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe

description	pid	process	target process
PID 2268 wrote to memory of 3732	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 3732	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 4792	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 4792	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 4236	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 4236	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 4788	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 4788	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 1500	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 1500	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 1344	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 1344	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	schtasks.exe
PID 2268 wrote to memory of 4436	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	WmiPrvSE.exe
PID 2268 wrote to memory of 4436	2268	51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe	WmiPrvSE.exe

C:\Users\Admin\AppData\Local\Temp\51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe
"C:\Users\Admin\AppData\Local\Temp\51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2.exe"
1⤵
- Adds Run key to start application
- Drops file in Program Files directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2268

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "SppExtComObj" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\SppExtComObj.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:3732

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files\Mozilla Firefox\gmp-clearkey\0.1\fontdrvhost.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:4792

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "upfc" /sc ONLOGON /tr "'C:\Documents and Settings\upfc.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:4236

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "System" /sc ONLOGON /tr "'C:\Documents and Settings\System.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:4788

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Windows Photo Viewer\en-US\csrss.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1500

C:\Windows\SYSTEM32\schtasks.exe
"schtasks" /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\ProgramData\Microsoft\MF\WmiPrvSE.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1344

C:\ProgramData\Microsoft\MF\WmiPrvSE.exe
"C:\ProgramData\Microsoft\MF\WmiPrvSE.exe"
2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:4436

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Registry Run Keys / Startup Folder

1

T1060

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\ProgramData\Microsoft\MF\WmiPrvSE.exe
Filesize
413KB

MD5
d42e209f293b2f4551ca20bbfaf685bf

SHA1
5e77d2a5933e32b57ef96464e94d4a2b692f6421

SHA256
51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2

SHA512
62580c3a1524d46c907b6c040d20bb67dbf375bc5c9fb0452bdadb30f21e42b9c1e40f0176ebd6eb437f2f7f47825398febaa147f0cb4459c2b19dbd011d0787

Download Submit
C:\ProgramData\Microsoft\MF\WmiPrvSE.exe
Filesize
413KB

MD5
d42e209f293b2f4551ca20bbfaf685bf

SHA1
5e77d2a5933e32b57ef96464e94d4a2b692f6421

SHA256
51757c2b6e29dce91c13dc76c9a75fba921144d80adc56e3fb36e3491ad461d2

SHA512
62580c3a1524d46c907b6c040d20bb67dbf375bc5c9fb0452bdadb30f21e42b9c1e40f0176ebd6eb437f2f7f47825398febaa147f0cb4459c2b19dbd011d0787

Download Submit
memory/1344-139-0x0000000000000000-mapping.dmp

Download
memory/1500-138-0x0000000000000000-mapping.dmp

Download
memory/2268-132-0x0000020171EE0000-0x0000020171F4E000-memory.dmp

Filesize
440KB

Download
memory/2268-133-0x00007FFCC3CB0000-0x00007FFCC4771000-memory.dmp

Filesize
10.8MB

Download
memory/2268-143-0x00007FFCC3CB0000-0x00007FFCC4771000-memory.dmp

Filesize
10.8MB

Download
memory/3732-134-0x0000000000000000-mapping.dmp

Download
memory/4236-136-0x0000000000000000-mapping.dmp

Download
memory/4436-140-0x0000000000000000-mapping.dmp

Download
memory/4436-144-0x00007FFCC3CB0000-0x00007FFCC4771000-memory.dmp

Filesize
10.8MB

Download
memory/4436-145-0x00007FFCC3CB0000-0x00007FFCC4771000-memory.dmp

Filesize
10.8MB

Download
memory/4436-146-0x00007FFCC3CB0000-0x00007FFCC4771000-memory.dmp

Filesize
10.8MB

Download
memory/4788-137-0x0000000000000000-mapping.dmp

Download
memory/4792-135-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads