dcrat | a887c9e1f514d97af106cbc3c0ef35790cc799aefb4d7d68a5e4c7e0eed74bd3

Analysis

max time kernel
148s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
29/05/2024, 01:47

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General

Target
a887c9e1f514d97af106cbc3c0ef35790cc799aefb4d7d68a5e4c7e0eed74bd3.exe
Size 1.6MB
Sample240529-b7k9gsec97
SHA256 a887c9e1f514d97af106cbc3c0ef35790cc799aefb4d7d68a5e4c7e0eed74bd3
MD5 b3955b1a2ea414216e153e295e5885fb
SHA1 13b2239b4c236f91f23d1aab519b0ffbb21f6e58
SHA512 6398c6e590552fc6105a9376c7902d70c0de276fc1fdb6b14f3be09c0fc391610138325e8fc560cb93f77f7316f4baf2d642c4ba758f644f945b79e0c5a2af6e
SSDEEP 24576:C2G/nvxW3W72Jy84qMZlat3KsPo9uZzW8G62IQfsfTtCnJUw:CbA3IGfn3Kp58G6fQfsbMnR
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 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	1248	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	720	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1100	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3304	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	440	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3160	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5040	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2160	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3560	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	400	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1608	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	736	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4980	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	5020	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1572	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4784	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3248	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1864	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1444	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4024	3340	schtasks.exe	87
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	4068	3340	schtasks.exe	87

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x00070000000233ce-10.dat	dcrat
behavioral2/memory/1932-13-0x00000000006D0000-0x0000000000818000-memory.dmp	dcrat

Checks computer location settings 2 TTPs 3 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-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	a887c9e1f514d97af106cbc3c0ef35790cc799aefb4d7d68a5e4c7e0eed74bd3.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	WScript.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000\Control Panel\International\Geo\Nation	providersession.exe

Executes dropped EXE 2 IoCs

pid	Process
1932	providersession.exe
2632	taskhostw.exe

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
25	ipinfo.io
26	ipinfo.io

Drops file in Program Files directory 6 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Common Files\System\it-IT\dllhost.exe	providersession.exe
File created	C:\Program Files (x86)\Common Files\System\it-IT\5940a34987c991	providersession.exe
File created	C:\Program Files (x86)\WindowsPowerShell\Configuration\Schema\StartMenuExperienceHost.exe	providersession.exe
File created	C:\Program Files (x86)\WindowsPowerShell\Configuration\Schema\55b276f4edf653	providersession.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\Registry.exe	providersession.exe
File created	C:\Program Files (x86)\Mozilla Maintenance Service\logs\ee2ad38f3d4382	providersession.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
3160	schtasks.exe
2160	schtasks.exe
3560	schtasks.exe
4980	schtasks.exe
4784	schtasks.exe
3248	schtasks.exe
1864	schtasks.exe
1248	schtasks.exe
3304	schtasks.exe
5040	schtasks.exe
1572	schtasks.exe
4068	schtasks.exe
720	schtasks.exe
400	schtasks.exe
1608	schtasks.exe
736	schtasks.exe
5020	schtasks.exe
1444	schtasks.exe
4024	schtasks.exe
1100	schtasks.exe
440	schtasks.exe

Modifies registry class 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000_Classes\Local Settings	a887c9e1f514d97af106cbc3c0ef35790cc799aefb4d7d68a5e4c7e0eed74bd3.exe
Key created	\REGISTRY\USER\S-1-5-21-2539840389-1261165778-1087677076-1000_Classes\Local Settings	providersession.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
1932	providersession.exe
1932	providersession.exe
1932	providersession.exe
1932	providersession.exe
1932	providersession.exe
1932	providersession.exe
1932	providersession.exe
2632	taskhostw.exe
2632	taskhostw.exe
2632	taskhostw.exe
2632	taskhostw.exe
2632	taskhostw.exe
2632	taskhostw.exe
2632	taskhostw.exe
2632	taskhostw.exe
2632	taskhostw.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2632	taskhostw.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1932	providersession.exe
Token: SeDebugPrivilege	2632	taskhostw.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1136 wrote to memory of 3488	1136	a887c9e1f514d97af106cbc3c0ef35790cc799aefb4d7d68a5e4c7e0eed74bd3.exe	81
PID 1136 wrote to memory of 3488	1136	a887c9e1f514d97af106cbc3c0ef35790cc799aefb4d7d68a5e4c7e0eed74bd3.exe	81
PID 1136 wrote to memory of 3488	1136	a887c9e1f514d97af106cbc3c0ef35790cc799aefb4d7d68a5e4c7e0eed74bd3.exe	81
PID 3488 wrote to memory of 2700	3488	WScript.exe	82
PID 3488 wrote to memory of 2700	3488	WScript.exe	82
PID 3488 wrote to memory of 2700	3488	WScript.exe	82
PID 2700 wrote to memory of 1932	2700	cmd.exe	84
PID 2700 wrote to memory of 1932	2700	cmd.exe	84
PID 1932 wrote to memory of 4100	1932	providersession.exe	109
PID 1932 wrote to memory of 4100	1932	providersession.exe	109
PID 4100 wrote to memory of 4432	4100	cmd.exe	111
PID 4100 wrote to memory of 4432	4100	cmd.exe	111
PID 4100 wrote to memory of 2632	4100	cmd.exe	114
PID 4100 wrote to memory of 2632	4100	cmd.exe	114

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\a887c9e1f514d97af106cbc3c0ef35790cc799aefb4d7d68a5e4c7e0eed74bd3.exe
"C:\Users\Admin\AppData\Local\Temp\a887c9e1f514d97af106cbc3c0ef35790cc799aefb4d7d68a5e4c7e0eed74bd3.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1136
- C:\Windows\SysWOW64\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\blockFont\jo84FJXwvkPyK8zViPyY4MD9OF.vbe"
  2⤵
  - Checks computer location settings
  - Suspicious use of WriteProcessMemory
  PID:3488
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Roaming\blockFont\vlHIsmOchOwy6mjxDg66fXSczVy2Cl.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2700
  - - C:\Users\Admin\AppData\Roaming\blockFont\providersession.exe
      "C:\Users\Admin\AppData\Roaming\blockFont\providersession.exe"
      4⤵
      Checks computer location settings
      Executes dropped EXE
      Drops file in Program Files directory
      Modifies registry class
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      Suspicious use of WriteProcessMemory
      PID:1932
    - - C:\Windows\System32\cmd.exe
        
        "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\HJdiGQlQiZ.bat"
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4100
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:4432
      - C:\Recovery\WindowsRE\taskhostw.exe
        
        "C:\Recovery\WindowsRE\taskhostw.exe"
        6⤵
        Executes dropped EXE
        Suspicious behavior: EnumeratesProcesses
        Suspicious behavior: GetForegroundWindowSpam
        Suspicious use of AdjustPrivilegeToken
        
        PID:2632

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 6 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1248

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:720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 14 /tr "'C:\Recovery\WindowsRE\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1100

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 12 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3304

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
- Creates scheduled task(s)
PID:440

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "wininitw" /sc MINUTE /mo 7 /tr "'C:\Recovery\WindowsRE\wininit.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3160

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\Common Files\System\it-IT\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:5040

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Common Files\System\it-IT\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2160

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Common Files\System\it-IT\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3560

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:400

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:1608

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "OfficeClickToRunO" /sc MINUTE /mo 11 /tr "'C:\Recovery\WindowsRE\OfficeClickToRun.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:736

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 8 /tr "'C:\Program Files (x86)\WindowsPowerShell\Configuration\Schema\StartMenuExperienceHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4980

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHost" /sc ONLOGON /tr "'C:\Program Files (x86)\WindowsPowerShell\Configuration\Schema\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:5020

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "StartMenuExperienceHostS" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\WindowsPowerShell\Configuration\Schema\StartMenuExperienceHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1572

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 7 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\Registry.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4784

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Registry" /sc ONLOGON /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3248

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "RegistryR" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Mozilla Maintenance Service\logs\Registry.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1864

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 12 /tr "'C:\Users\Admin\3D Objects\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1444

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Users\Admin\3D Objects\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4024

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 5 /tr "'C:\Users\Admin\3D Objects\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4068

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

HJdiGQlQiZ.bat

Path C:\Users\Admin\AppData\Local\Temp\HJdiGQlQiZ.bat
Size 200B
SHA256 37dc7ca0ba51ca39cd0d94b98e5811520548a41aeb04fd93fe789955d563a494
MD5 f9b6db6dfff892b899e59c2682975180
SHA1 4dcf9ea895e7075a88fce5c5577159184b044b4e
SHA512 25296f8b0cc582ad6c3f644a94b6f9186b5e69d8de3d9841e8181b0f622260645ed09b3f09a029524e096b48548825aee1374997a2bc9b0f5123fc372850d04b
MD5 SHA1 SHA512

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jo84FJXwvkPyK8zViPyY4MD9OF.vbe

Path C:\Users\Admin\AppData\Roaming\blockFont\jo84FJXwvkPyK8zViPyY4MD9OF.vbe
Size 223B
SHA256 12f52d2e340d1a403579606a428440ecade4effd85d8798eb9ac385b4716291f
MD5 323d37202d29e700ed2a258e84617608
SHA1 147704280b26c331c0110e8a1ee85b0ae93d7ba4
SHA512 65634a2803237cb78cac955610123ba0c470a30e018006a051a290f06142361bf0f2001aeb6340f591880576bb99428ff593f090fc370cd782ded4c63b0cc5f0
MD5 SHA1 SHA512

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providersession.exe

Path C:\Users\Admin\AppData\Roaming\blockFont\providersession.exe
Size 1.3MB
SHA256 fa46bee195ccb4792d217887f2a5c3f4557620453c9a3697250eaff731571193
MD5 7aee1283d0716535aabf45b9c6391da0
SHA1 038cfa335392082465b7cae9c8e976df7cd2af9c
SHA512 6493cd315c24cf3379e414a25148574d9f40be794dff624bc180c8e89ce4dfb372e9ce8c55b10f59efc364f223561a73cd2a7f7924c83a0cc836392c11acdb16
SSDEEP 24576:I84qMZlat3KsPo9uZzW8G62IQfsfTtCnJU:tn3Kp58G6fQfsbMn
MD5 SHA1 SHA512 SSDEEP

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vlHIsmOchOwy6mjxDg66fXSczVy2Cl.bat

Path C:\Users\Admin\AppData\Roaming\blockFont\vlHIsmOchOwy6mjxDg66fXSczVy2Cl.bat
Size 41B
SHA256 d0d14d2e4334203fe010726a3e16d7449f0f1f0e1ef65601c071725b3fb7a674
MD5 8232f49977349c5a3d538f1ddf3b5f7a
SHA1 d54e2ef41eb60ec98e89ad9319d3dd08fc3b68dc
SHA512 e0766f4a0bfca5a2af5799fdc628603e47b9965fe03a51b72a4ba672bdea0d0475b0e0d33c90571fc1ffcdba3b7fa3e66bed8b5cefb4d07a3b746f8d6f286ec3
MD5 SHA1 SHA512

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memory/1932-15-0x0000000001140000-0x000000000114E000-memory.dmp

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memory/1932-14-0x0000000001130000-0x000000000113E000-memory.dmp

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memory/1932-13-0x00000000006D0000-0x0000000000818000-memory.dmp

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memory/1932-16-0x0000000002A50000-0x0000000002A58000-memory.dmp

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memory/1932-17-0x0000000002A80000-0x0000000002A9C000-memory.dmp

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memory/1932-18-0x000000001BB70000-0x000000001BBC0000-memory.dmp

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memory/1932-19-0x0000000002A60000-0x0000000002A6C000-memory.dmp

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memory/1932-20-0x0000000002AA0000-0x0000000002AB2000-memory.dmp

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memory/1932-21-0x000000001C230000-0x000000001C758000-memory.dmp

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memory/1932-12-0x00007FFB83E63000-0x00007FFB83E65000-memory.dmp

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