dcrat | 3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731

General

Target

3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
Size

828KB
MD5

af741ec427d46644c68572c50f87d61e
SHA1

7e31fdcd599478fe8e6b9b07be11ff307d79ce53
SHA256

3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731
SHA512

ae5a81bcf21c60b32e67be306daa8eeb6bfa5e24723e46c8519ea095fccaf3509ba6a3f0372a0e4412d75f1c16eb0e634a3f31a77bb68c248d238c45af5896e8
SSDEEP

12288:dKAvgOSpwbrYBil5nRRWZlN4CBe1bqOhSiXLu5uWWDKT+pDu:hvgOSpwYE53+4F+OhzlmT+pDu

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 21 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	1616	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3020	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3328	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2404	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2556	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4280	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1584	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2624	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3404	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3880	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	456	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3976	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	940	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	512	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1124	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1048	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4364	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2576	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1324	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	404	1200	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2476	1200	schtasks.exe	84

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/3408-0-0x0000000000CF0000-0x0000000000DC6000-memory.dmp	dcrat
behavioral2/files/0x0006000000023256-11.dat	dcrat

Checks computer location settings 2 TTPs 1 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-1-5-21-3336304223-2978740688-3645194410-1000\Control Panel\International\Geo\Nation	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe

Executes dropped EXE 1 IoCs

pid	Process
868	explorer.exe

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File created	C:\Program Files\Internet Explorer\es-ES\5940a34987c991	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
File created	C:\Program Files\MSBuild\dllhost.exe	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
File created	C:\Program Files\MSBuild\5940a34987c991	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
File created	C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\sysmon.exe	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
File created	C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\121e5b5079f7c0	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
File created	C:\Program Files\Internet Explorer\es-ES\dllhost.exe	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\Prefetch\ReadyBoot\dllhost.exe	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
File created	C:\Windows\Prefetch\ReadyBoot\5940a34987c991	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 21 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2556	schtasks.exe
2624	schtasks.exe
3976	schtasks.exe
2576	schtasks.exe
404	schtasks.exe
1616	schtasks.exe
2404	schtasks.exe
3404	schtasks.exe
940	schtasks.exe
512	schtasks.exe
1124	schtasks.exe
3020	schtasks.exe
1584	schtasks.exe
1048	schtasks.exe
3328	schtasks.exe
4280	schtasks.exe
4364	schtasks.exe
1324	schtasks.exe
2476	schtasks.exe
3880	schtasks.exe
456	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-3336304223-2978740688-3645194410-1000_Classes\Local Settings	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe

Suspicious behavior: EnumeratesProcesses 20 IoCs

pid	Process
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
868	explorer.exe
868	explorer.exe
868	explorer.exe
868	explorer.exe
868	explorer.exe
868	explorer.exe
868	explorer.exe
868	explorer.exe
868	explorer.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
868	explorer.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
Token: SeDebugPrivilege	868	explorer.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3408 wrote to memory of 2496	3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe	106
PID 3408 wrote to memory of 2496	3408	3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe	106
PID 2496 wrote to memory of 3124	2496	cmd.exe	108
PID 2496 wrote to memory of 3124	2496	cmd.exe	108
PID 2496 wrote to memory of 868	2496	cmd.exe	109
PID 2496 wrote to memory of 868	2496	cmd.exe	109

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\3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe
"C:\Users\Admin\AppData\Local\Temp\3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe"
1⤵
- 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:3408
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\nbwo7iYS6J.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2496
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:3124
- - C:\odt\explorer.exe
    "C:\odt\explorer.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    PID:868

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 6 /tr "'C:\odt\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\odt\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3020

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 10 /tr "'C:\odt\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3328

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2404

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2556

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4280

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 14 /tr "'C:\Windows\Prefetch\ReadyBoot\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1584

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 6 /tr "'C:\Windows\Prefetch\ReadyBoot\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\Prefetch\ReadyBoot\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3404

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\sysmon.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3880

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmon" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sysmons" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Microsoft\EdgeUpdate_bk\sysmon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3976

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731" /sc ONLOGON /tr "'C:\odt\3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:940

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf7313" /sc MINUTE /mo 10 /tr "'C:\odt\3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:512

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf7313" /sc MINUTE /mo 5 /tr "'C:\odt\3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1124

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 9 /tr "'C:\Program Files\Internet Explorer\es-ES\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1048

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files\Internet Explorer\es-ES\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4364

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 11 /tr "'C:\Program Files\Internet Explorer\es-ES\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2576

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files\MSBuild\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1324

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 11 /tr "'C:\Program Files\MSBuild\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:404

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 10 /tr "'C:\Program Files\MSBuild\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2476

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\nbwo7iYS6J.bat

Filesize
184B

MD5
3246d70029d04d4b8aeefd50bf452212

SHA1
a883c2b8cf660f91028ab325778485a910307929

SHA256
57134f6df1cac5e4c423923efdba3027f707696298964a3691df85107a69b6e4

SHA512
4577fc1fd4d0016a314944c0df1e1d3ed5f9c3b6eb60cffa01cd0fb3d3b310c8bae1ee928113e72d74cd570d14428a116ea1a097ff4d5b515910215a5468c167

Download Submit
C:\odt\3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731.exe

Filesize
828KB

MD5
af741ec427d46644c68572c50f87d61e

SHA1
7e31fdcd599478fe8e6b9b07be11ff307d79ce53

SHA256
3e4493f78ba3b135a512c640d1aee8b6938f3613521d8a9262ef31b604fbf731

SHA512
ae5a81bcf21c60b32e67be306daa8eeb6bfa5e24723e46c8519ea095fccaf3509ba6a3f0372a0e4412d75f1c16eb0e634a3f31a77bb68c248d238c45af5896e8

Download Submit
memory/868-27-0x00007FFC6F680000-0x00007FFC70141000-memory.dmp

Filesize
10.8MB

Download
memory/868-28-0x0000000001330000-0x0000000001340000-memory.dmp

Filesize
64KB

Download
memory/868-29-0x00007FFC6F680000-0x00007FFC70141000-memory.dmp

Filesize
10.8MB

Download
memory/868-30-0x0000000001330000-0x0000000001340000-memory.dmp

Filesize
64KB

Download
memory/3408-0-0x0000000000CF0000-0x0000000000DC6000-memory.dmp

Filesize
856KB

Download
memory/3408-1-0x00007FFC6F9B0000-0x00007FFC70471000-memory.dmp

Filesize
10.8MB

Download
memory/3408-2-0x0000000002EC0000-0x0000000002ED0000-memory.dmp

Filesize
64KB

Download
memory/3408-23-0x00007FFC6F9B0000-0x00007FFC70471000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads