dcrat | b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5

General

Target

b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe
Size

381KB
MD5

d944666a3de314aa9304e02b1a5b7e8c
SHA1

8fe5dec1d2c7a9c3415378bbb398989a2f80ceed
SHA256

b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5
SHA512

49f6763fb7e7e5f798f3f747b1bfc2cd2ca710f7d4364ac2edc12db8a3cd878b6b5a70d91414b821746e68a4fd9b922487a8486d9051d9839bdd699473f0a356
SSDEEP

6144:j1gkdILtmndjOS4kfg0gooMUzNQgsrQXp6SMt8/qqDL:jjndjTFgz5QhvSMtXqn

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

DCRat payload 4 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

Processes:

resource	yara_rule
behavioral1/memory/1396-54-0x0000000000E50000-0x0000000000EB8000-memory.dmp	dcrat
C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\spoolsv.exe	dcrat
C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\spoolsv.exe	dcrat
behavioral1/memory/1152-64-0x0000000000C20000-0x0000000000C88000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

Processes:

spoolsv.exe

pid process

1152 spoolsv.exe

pid	process
1152	spoolsv.exe

Drops file in Program Files directory 2 IoCs

Processes:

b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe

description	ioc	process
File created	C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\lsass.exe	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe
File created	C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\6203df4a6bafc7c328ee7f6f8ca0a8a838a8a1b9	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe

Drops file in Windows directory 2 IoCs

Processes:

b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe

description	ioc	process
File created	C:\Windows\twain_32\6ccacd8608530fba3a93e87ae2225c7032aa18c1	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe
File created	C:\Windows\twain_32\Idle.exe	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.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

1376 schtasks.exe
1068 schtasks.exe
1520 schtasks.exe
1504 schtasks.exe
1720 schtasks.exe
1248 schtasks.exe
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exespoolsv.exe

pid process

1396 b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe
1152 spoolsv.exe

pid	process
1376	schtasks.exe
1068	schtasks.exe
1520	schtasks.exe
1504	schtasks.exe
1720	schtasks.exe
1248	schtasks.exe

pid	process
1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe
1152	spoolsv.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exespoolsv.exe

description	pid	process
Token: SeDebugPrivilege	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe
Token: SeDebugPrivilege	1152	spoolsv.exe

Suspicious use of WriteProcessMemory 21 IoCs

Processes:

b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe

description	pid	process	target process
PID 1396 wrote to memory of 1068	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1068	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1068	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1520	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1520	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1520	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1504	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1504	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1504	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1720	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1720	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1720	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1248	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1248	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1248	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1376	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1376	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1376	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	schtasks.exe
PID 1396 wrote to memory of 1152	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	spoolsv.exe
PID 1396 wrote to memory of 1152	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	spoolsv.exe
PID 1396 wrote to memory of 1152	1396	b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe	spoolsv.exe

C:\Users\Admin\AppData\Local\Temp\b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe
"C:\Users\Admin\AppData\Local\Temp\b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe"
1⤵
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1396

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "WmiPrvSE" /sc ONLOGON /tr "'C:\Documents and Settings\WmiPrvSE.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1068

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5" /sc ONLOGON /tr "'C:\Users\All Users\b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1520

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "Idle" /sc ONLOGON /tr "'C:\Windows\twain_32\Idle.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1504

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "taskhost" /sc ONLOGON /tr "'C:\PerfLogs\Admin\taskhost.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1720

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft Synchronization Services\ADO.NET\v1.0\lsass.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1248

C:\Windows\system32\schtasks.exe
"schtasks" /create /tn "spoolsv" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\spoolsv.exe'" /rl HIGHEST /f
2⤵
- Creates scheduled task(s)
PID:1376

C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\spoolsv.exe
"C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\spoolsv.exe"
2⤵
- Executes dropped EXE
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
PID:1152

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Scheduled Task

1

T1053

Persistence

Scheduled Task

1

T1053

Privilege Escalation

Scheduled Task

1

T1053

Defense Evasion

Credential Access

Discovery

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\spoolsv.exe
Filesize
381KB

MD5
d944666a3de314aa9304e02b1a5b7e8c

SHA1
8fe5dec1d2c7a9c3415378bbb398989a2f80ceed

SHA256
b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5

SHA512
49f6763fb7e7e5f798f3f747b1bfc2cd2ca710f7d4364ac2edc12db8a3cd878b6b5a70d91414b821746e68a4fd9b922487a8486d9051d9839bdd699473f0a356

Download Submit
C:\MSOCache\All Users\{90140000-0116-0409-1000-0000000FF1CE}-C\spoolsv.exe
Filesize
381KB

MD5
d944666a3de314aa9304e02b1a5b7e8c

SHA1
8fe5dec1d2c7a9c3415378bbb398989a2f80ceed

SHA256
b8a05f1b87a44a0b3180c17f00e9797c080452bea0b5cbcb8d1fbe8e39f8ebf5

SHA512
49f6763fb7e7e5f798f3f747b1bfc2cd2ca710f7d4364ac2edc12db8a3cd878b6b5a70d91414b821746e68a4fd9b922487a8486d9051d9839bdd699473f0a356

Download Submit
memory/1068-55-0x0000000000000000-mapping.dmp

Download
memory/1152-61-0x0000000000000000-mapping.dmp

Download
memory/1152-64-0x0000000000C20000-0x0000000000C88000-memory.dmp

Filesize
416KB

Download
memory/1248-59-0x0000000000000000-mapping.dmp

Download
memory/1376-60-0x0000000000000000-mapping.dmp

Download
memory/1396-54-0x0000000000E50000-0x0000000000EB8000-memory.dmp

Filesize
416KB

Download
memory/1504-57-0x0000000000000000-mapping.dmp

Download
memory/1520-56-0x0000000000000000-mapping.dmp

Download
memory/1720-58-0x0000000000000000-mapping.dmp

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

Loading Replay Monitor...

Downloads