dcrat | f0ac345cd615b9233b1436e380a0130863da5945f7a73a24877210a9ad4bc805

General

Target

7d8db13b60e52fa8f795d68381eb2317.exe
Size

827KB
MD5

7d8db13b60e52fa8f795d68381eb2317
SHA1

cf815f00bf53482199124c6fed99c487f85e1d6e
SHA256

f0ac345cd615b9233b1436e380a0130863da5945f7a73a24877210a9ad4bc805
SHA512

d41f783a057e022bce577b4f90e6f031b86ba459856a532f75fb2a2405c1c30c589afa945278fe30a6b7e2b6115b5aca7756a791556d1f82b959dc06c6435768
SSDEEP

12288:i89kbsLqJ5RqavS3UCBe41kBEsIPtvz4OerNHcaMXb:w4LqJ5RqZ3UCBeYRbTexH8Xb

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 family
dcrat

Process spawned unexpected child process 9 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	4172	2920	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4388	2920	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1664	2920	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3144	2920	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2572	2920	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4080	2920	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5060	2920	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2712	2920	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1300	2920	schtasks.exe	84

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/3940-1-0x0000000000060000-0x0000000000136000-memory.dmp	dcrat
behavioral2/files/0x0008000000023c93-16.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-1-5-21-1045960512-3948844814-3059691613-1000\Control Panel\International\Geo\Nation	7d8db13b60e52fa8f795d68381eb2317.exe

Executes dropped EXE 1 IoCs

pid	Process
1572	RuntimeBroker.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-1045960512-3948844814-3059691613-1000_Classes\Local Settings	7d8db13b60e52fa8f795d68381eb2317.exe

Scheduled Task/Job: Scheduled Task 1 TTPs 9 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4388	schtasks.exe
3144	schtasks.exe
2572	schtasks.exe
1300	schtasks.exe
4172	schtasks.exe
1664	schtasks.exe
4080	schtasks.exe
5060	schtasks.exe
2712	schtasks.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
3940	7d8db13b60e52fa8f795d68381eb2317.exe
1572	RuntimeBroker.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3940	7d8db13b60e52fa8f795d68381eb2317.exe
Token: SeDebugPrivilege	1572	RuntimeBroker.exe

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 3940 wrote to memory of 5008	3940	7d8db13b60e52fa8f795d68381eb2317.exe	94
PID 3940 wrote to memory of 5008	3940	7d8db13b60e52fa8f795d68381eb2317.exe	94
PID 5008 wrote to memory of 2972	5008	cmd.exe	96
PID 5008 wrote to memory of 2972	5008	cmd.exe	96
PID 5008 wrote to memory of 1572	5008	cmd.exe	104
PID 5008 wrote to memory of 1572	5008	cmd.exe	104

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\7d8db13b60e52fa8f795d68381eb2317.exe
"C:\Users\Admin\AppData\Local\Temp\7d8db13b60e52fa8f795d68381eb2317.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3940
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\i6FNlRHyuX.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:5008
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:2972
- - C:\Users\Default\Downloads\RuntimeBroker.exe
    "C:\Users\Default\Downloads\RuntimeBroker.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 9 /tr "'C:\Users\Default\Downloads\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4172

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\Default\Downloads\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4388

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Users\Default\Downloads\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:1664

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:3144

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininit" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 9 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:4080

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 14 /tr "'C:\Users\Default\Favorites\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:5060

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Users\Default\Favorites\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Scheduled Task/Job: Scheduled Task
PID:2712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 8 /tr "'C:\Users\Default\Favorites\sihost.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

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\i6FNlRHyuX.bat

Filesize
209B

MD5
860dce4bb4723455a14e8642fa370b27

SHA1
b71669343f6a26eb1d26340c06034c56393734fa

SHA256
adc9794c35eaad243f412d5c87f1ddf7d893c1305caaa14af1d5d17255458d37

SHA512
d84ac3c89119e773121a44c44cd3fa634db6c3f372f9bf414e08c186c12b9144519606cc3ff7071877d73e06082cef772e460629b18f3f6982c4150a54edf9d5

Download Submit
C:\Users\Default\Downloads\RuntimeBroker.exe

Filesize
827KB

MD5
7d8db13b60e52fa8f795d68381eb2317

SHA1
cf815f00bf53482199124c6fed99c487f85e1d6e

SHA256
f0ac345cd615b9233b1436e380a0130863da5945f7a73a24877210a9ad4bc805

SHA512
d41f783a057e022bce577b4f90e6f031b86ba459856a532f75fb2a2405c1c30c589afa945278fe30a6b7e2b6115b5aca7756a791556d1f82b959dc06c6435768

Download Submit
memory/3940-0-0x00007FFA247E3000-0x00007FFA247E5000-memory.dmp

Filesize
8KB

Download
memory/3940-1-0x0000000000060000-0x0000000000136000-memory.dmp

Filesize
856KB

Download
memory/3940-3-0x00007FFA247E0000-0x00007FFA252A1000-memory.dmp

Filesize
10.8MB

Download
memory/3940-15-0x00007FFA247E0000-0x00007FFA252A1000-memory.dmp

Filesize
10.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads