dcrat | 00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c

Analysis

max time kernel
132s
max time network
125s
platform
windows10-2004_x64
resource
win10v2004-20240426-en
resource tags

arch:x64arch:x86image:win10v2004-20240426-enlocale:en-usos:windows10-2004-x64system
submitted
16/05/2024, 17:27

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General

Target
00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
Size 828KB
Sample240516-v1rbpsfg32
SHA256 00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c
MD5 1b8dc013de93bb0edf121b38e7f8ab6f
SHA1 2c17ada00c2b779f5e04a801265f151591e11e18
SHA512 4b23622774ea394608ade50bac520aebd64788d626e9fc316e57db8f4a4628cec221420955adae70d7ddcd7c273f6cac409d64f931e01e1a490b275788370d33
SSDEEP 12288:K8rQgxfLc/EHk/2Wk3D0bdxTZiLaO4Vb/5:VrzxfLFkHbXdVLVb/5
MD5 SHA1 SHA512 SSDEEP

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 30 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	1448	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2096	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5052	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	372	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4284	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1972	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3508	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2196	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	612	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4896	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2432	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	216	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4296	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3848	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2576	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3280	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	616	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2492	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4900	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2904	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2828	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2844	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2400	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1268	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3356	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2716	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4380	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	316	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4316	1328	schtasks.exe	84
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	392	1328	schtasks.exe	84

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/1824-1-0x0000000000CF0000-0x0000000000DC6000-memory.dmp	dcrat
behavioral2/files/0x0007000000023423-11.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-1-5-21-540404634-651139247-2967210625-1000\Control Panel\International\Geo\Nation	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe

Executes dropped EXE 1 IoCs

pid	Process
4688	winlogon.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Google\lsass.exe	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
File created	C:\Program Files (x86)\Google\6203df4a6bafc7	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe

Drops file in Windows directory 9 IoCs

description	ioc	Process
File created	C:\Windows\Globalization\Sorting\eddb19405b7ce1	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
File created	C:\Windows\debug\cc11b995f2a76d	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
File created	C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\upfc.exe	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
File created	C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\ea1d8f6d871115	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
File created	C:\Windows\TAPI\886983d96e3d3e	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
File created	C:\Windows\debug\winlogon.exe	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
File opened for modification	C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\upfc.exe	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
File created	C:\Windows\TAPI\csrss.exe	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
File created	C:\Windows\Globalization\Sorting\backgroundTaskHost.exe	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.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 30 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
616	schtasks.exe
2400	schtasks.exe
1268	schtasks.exe
4380	schtasks.exe
4284	schtasks.exe
1972	schtasks.exe
2716	schtasks.exe
4316	schtasks.exe
392	schtasks.exe
2096	schtasks.exe
4896	schtasks.exe
3356	schtasks.exe
316	schtasks.exe
4900	schtasks.exe
2828	schtasks.exe
2432	schtasks.exe
3848	schtasks.exe
1448	schtasks.exe
5052	schtasks.exe
2844	schtasks.exe
3508	schtasks.exe
612	schtasks.exe
2904	schtasks.exe
216	schtasks.exe
2492	schtasks.exe
4296	schtasks.exe
2576	schtasks.exe
3280	schtasks.exe
372	schtasks.exe
2196	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1824	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
1824	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
1824	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
1824	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
1824	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
4688	winlogon.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1824	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
Token: SeDebugPrivilege	4688	winlogon.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 1824 wrote to memory of 4688	1824	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe	115
PID 1824 wrote to memory of 4688	1824	00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe	115

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\00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe
"C:\Users\Admin\AppData\Local\Temp\00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c.exe"
1⤵
- Checks computer location settings
- Drops file in Program Files directory
- Drops file in Windows directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1824
- C:\Windows\debug\winlogon.exe
  "C:\Windows\debug\winlogon.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:4688

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 7 /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\upfc.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1448

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2096

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 8 /tr "'C:\Windows\Installer\{AC76BA86-7AD7-1033-7B44-AC0F074E4100}\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:5052

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 10 /tr "'C:\Recovery\WindowsRE\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:372

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4284

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1972

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 8 /tr "'C:\Users\All Users\ssh\System.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3508

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "System" /sc ONLOGON /tr "'C:\Users\All Users\ssh\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2196

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "SystemS" /sc MINUTE /mo 14 /tr "'C:\Users\All Users\ssh\System.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:612

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Google\lsass.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4896

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsass" /sc ONLOGON /tr "'C:\Program Files (x86)\Google\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2432

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "lsassl" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Google\lsass.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:216

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 7 /tr "'C:\Windows\TAPI\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4296

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Windows\TAPI\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3848

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Windows\TAPI\csrss.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 "RuntimeBrokerR" /sc MINUTE /mo 9 /tr "'C:\Users\Public\Pictures\RuntimeBroker.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3280

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBroker" /sc ONLOGON /tr "'C:\Users\Public\Pictures\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:616

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RuntimeBrokerR" /sc MINUTE /mo 11 /tr "'C:\Users\Public\Pictures\RuntimeBroker.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2492

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4900

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRun" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2904

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 5 /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2828

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 11 /tr "'C:\Windows\Globalization\Sorting\backgroundTaskHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2844

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\Globalization\Sorting\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2400

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 10 /tr "'C:\Windows\Globalization\Sorting\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1268

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 8 /tr "'C:\Windows\debug\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3356

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Windows\debug\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2716

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 9 /tr "'C:\Windows\debug\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4380

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 5 /tr "'C:\Users\Default User\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:316

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\Default User\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4316

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 10 /tr "'C:\Users\Default User\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:392

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

csrss.exe

Path C:\Windows\TAPI\csrss.exe
Size 828KB
SHA256 00126f1a772fd459793f811457950e42177537f6387a76124d26b57266a79f1c
MD5 1b8dc013de93bb0edf121b38e7f8ab6f
SHA1 2c17ada00c2b779f5e04a801265f151591e11e18
SHA512 4b23622774ea394608ade50bac520aebd64788d626e9fc316e57db8f4a4628cec221420955adae70d7ddcd7c273f6cac409d64f931e01e1a490b275788370d33
SSDEEP 12288:K8rQgxfLc/EHk/2Wk3D0bdxTZiLaO4Vb/5:VrzxfLFkHbXdVLVb/5
MD5 SHA1 SHA512 SSDEEP

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memory/1824-0-0x00007FFE3EE63000-0x00007FFE3EE65000-memory.dmp

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memory/1824-1-0x0000000000CF0000-0x0000000000DC6000-memory.dmp

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memory/1824-4-0x00007FFE3EE60000-0x00007FFE3F921000-memory.dmp

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memory/1824-34-0x00007FFE3EE60000-0x00007FFE3F921000-memory.dmp

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