dcrat | f7d99a21243a3f643960b9c4ca7c006a71d2f2cd46d1aed4e8fe615dba6f9376

Analysis

max time kernel
146s
max time network
149s
platform
windows7_x64
resource
win7-20240508-en
resource tags

arch:x64arch:x86image:win7-20240508-enlocale:en-usos:windows7-x64system
submitted
26/05/2024, 23:31

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General

Target
1a72ad3d430f9a080a432f48ebe3be5c.exe
Size 2.3MB
Sample240526-3hpddsga8v
SHA256 f7d99a21243a3f643960b9c4ca7c006a71d2f2cd46d1aed4e8fe615dba6f9376
MD5 1a72ad3d430f9a080a432f48ebe3be5c
SHA1 184222dcb4a05f1c11ca3bf9ac8697eca6d3cc76
SHA512 cd4a7747179e10d83ac42cfc280dcd81a61cf1c2914a7b4607b734fe76a83e0388df0c1112354cd08068f4dfe3c9e375a918113ebe03e7eccce1759caddc6439
SSDEEP 49152:ThKinMhilIRoMIU2QRzKa/Au5ByyhveVp4fX:FKcMhikzIUXRx93hGgX
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 18 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	2720	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2732	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2612	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1944	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2784	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2684	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2624	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2396	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2508	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2192	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2976	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2992	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2560	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2800	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2812	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2928	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1504	1640	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1528	1640	schtasks.exe	28

DCRat payload 3 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/1656-1-0x00000000000B0000-0x0000000000302000-memory.dmp	dcrat
behavioral1/files/0x0006000000016455-18.dat	dcrat
behavioral1/memory/1872-30-0x0000000000C80000-0x0000000000ED2000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
1872	explorer.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 2 IoCs

Web Service

T1102

flow	ioc
3	pastebin.com
2	pastebin.com

Drops file in Program Files directory 5 IoCs

description	ioc	Process
File created	C:\Program Files\Java\jre7\lib\42af1c969fbb7b	1a72ad3d430f9a080a432f48ebe3be5c.exe
File created	C:\Program Files (x86)\Microsoft.NET\RedistList\csrss.exe	1a72ad3d430f9a080a432f48ebe3be5c.exe
File opened for modification	C:\Program Files (x86)\Microsoft.NET\RedistList\csrss.exe	1a72ad3d430f9a080a432f48ebe3be5c.exe
File created	C:\Program Files (x86)\Microsoft.NET\RedistList\886983d96e3d3e	1a72ad3d430f9a080a432f48ebe3be5c.exe
File created	C:\Program Files\Java\jre7\lib\audiodg.exe	1a72ad3d430f9a080a432f48ebe3be5c.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\L2Schemas\spoolsv.exe	1a72ad3d430f9a080a432f48ebe3be5c.exe
File created	C:\Windows\L2Schemas\f3b6ecef712a24	1a72ad3d430f9a080a432f48ebe3be5c.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 18 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2396	schtasks.exe
2192	schtasks.exe
1944	schtasks.exe
2560	schtasks.exe
2812	schtasks.exe
1528	schtasks.exe
2732	schtasks.exe
2612	schtasks.exe
2784	schtasks.exe
2624	schtasks.exe
2800	schtasks.exe
2928	schtasks.exe
2720	schtasks.exe
2684	schtasks.exe
2508	schtasks.exe
2976	schtasks.exe
2992	schtasks.exe
1504	schtasks.exe

Suspicious behavior: EnumeratesProcesses 16 IoCs

pid	Process
1656	1a72ad3d430f9a080a432f48ebe3be5c.exe
1656	1a72ad3d430f9a080a432f48ebe3be5c.exe
1656	1a72ad3d430f9a080a432f48ebe3be5c.exe
1656	1a72ad3d430f9a080a432f48ebe3be5c.exe
1656	1a72ad3d430f9a080a432f48ebe3be5c.exe
1656	1a72ad3d430f9a080a432f48ebe3be5c.exe
1656	1a72ad3d430f9a080a432f48ebe3be5c.exe
1872	explorer.exe
1872	explorer.exe
1872	explorer.exe
1872	explorer.exe
1872	explorer.exe
1872	explorer.exe
1872	explorer.exe
1872	explorer.exe
1872	explorer.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
1872	explorer.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1656	1a72ad3d430f9a080a432f48ebe3be5c.exe
Token: SeDebugPrivilege	1872	explorer.exe

Suspicious use of WriteProcessMemory 9 IoCs

description	pid	Process	procid_target
PID 1656 wrote to memory of 2216	1656	1a72ad3d430f9a080a432f48ebe3be5c.exe	47
PID 1656 wrote to memory of 2216	1656	1a72ad3d430f9a080a432f48ebe3be5c.exe	47
PID 1656 wrote to memory of 2216	1656	1a72ad3d430f9a080a432f48ebe3be5c.exe	47
PID 2216 wrote to memory of 1708	2216	cmd.exe	49
PID 2216 wrote to memory of 1708	2216	cmd.exe	49
PID 2216 wrote to memory of 1708	2216	cmd.exe	49
PID 2216 wrote to memory of 1872	2216	cmd.exe	50
PID 2216 wrote to memory of 1872	2216	cmd.exe	50
PID 2216 wrote to memory of 1872	2216	cmd.exe	50

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\1a72ad3d430f9a080a432f48ebe3be5c.exe
"C:\Users\Admin\AppData\Local\Temp\1a72ad3d430f9a080a432f48ebe3be5c.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:1656
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Bp2XEEDsPY.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2216
- - C:\Windows\system32\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    PID:1708
- - C:\Users\Public\explorer.exe
    "C:\Users\Public\explorer.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    PID:1872

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2720

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2732

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Program Files (x86)\Microsoft.NET\RedistList\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2612

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 6 /tr "'C:\Program Files\Java\jre7\lib\audiodg.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1944

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodg" /sc ONLOGON /tr "'C:\Program Files\Java\jre7\lib\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2784

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "audiodga" /sc MINUTE /mo 6 /tr "'C:\Program Files\Java\jre7\lib\audiodg.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2684

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 6 /tr "'C:\Windows\L2Schemas\spoolsv.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2624

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsv" /sc ONLOGON /tr "'C:\Windows\L2Schemas\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2396

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "spoolsvs" /sc MINUTE /mo 8 /tr "'C:\Windows\L2Schemas\spoolsv.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2508

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 7 /tr "'C:\Users\Public\explorer.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2192

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorer" /sc ONLOGON /tr "'C:\Users\Public\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2976

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "explorere" /sc MINUTE /mo 14 /tr "'C:\Users\Public\explorer.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2992

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 6 /tr "'C:\Recovery\8f60a382-0d98-11ef-817d-5aba25856535\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2560

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Recovery\8f60a382-0d98-11ef-817d-5aba25856535\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2800

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 9 /tr "'C:\Recovery\8f60a382-0d98-11ef-817d-5aba25856535\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2812

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 12 /tr "'C:\Users\All Users\Microsoft Help\winlogon.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2928

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogon" /sc ONLOGON /tr "'C:\Users\All Users\Microsoft Help\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1504

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "winlogonw" /sc MINUTE /mo 14 /tr "'C:\Users\All Users\Microsoft Help\winlogon.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1528

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

Web Service

T1102

Exfiltration

Impact

Replay Monitor

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Downloads

csrss.exe

Path C:\Recovery\8f60a382-0d98-11ef-817d-5aba25856535\csrss.exe
Size 2.3MB
SHA256 f7d99a21243a3f643960b9c4ca7c006a71d2f2cd46d1aed4e8fe615dba6f9376
MD5 1a72ad3d430f9a080a432f48ebe3be5c
SHA1 184222dcb4a05f1c11ca3bf9ac8697eca6d3cc76
SHA512 cd4a7747179e10d83ac42cfc280dcd81a61cf1c2914a7b4607b734fe76a83e0388df0c1112354cd08068f4dfe3c9e375a918113ebe03e7eccce1759caddc6439
SSDEEP 49152:ThKinMhilIRoMIU2QRzKa/Au5ByyhveVp4fX:FKcMhikzIUXRx93hGgX
MD5 SHA1 SHA512 SSDEEP

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Bp2XEEDsPY.bat

Path C:\Users\Admin\AppData\Local\Temp\Bp2XEEDsPY.bat
Size 193B
SHA256 48fe5abbe91019cde66bed55a5e63938e5f13c4e0aee1b93c4461e0df4826d46
MD5 023ae901536f032edf432887085ac635
SHA1 30cd2cd70962e3469907a2873cee683d420fb19c
SHA512 5683a125a03e890e83993ab8b22facdb0e1cbc26e6dc9ff0af393e7e9811e9076d6f4247072ff7fb8d36cf63f7185018d6c05f4ea49bce74e2c5e41881f4470b
MD5 SHA1 SHA512

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memory/1656-6-0x00000000009F0000-0x0000000000A02000-memory.dmp

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memory/1656-3-0x00000000007A0000-0x00000000007BC000-memory.dmp

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memory/1656-5-0x000000001AE40000-0x000000001AE96000-memory.dmp

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memory/1656-4-0x00000000009D0000-0x00000000009E6000-memory.dmp

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memory/1656-0-0x000007FEF5753000-0x000007FEF5754000-memory.dmp

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memory/1656-7-0x00000000020C0000-0x00000000020CE000-memory.dmp

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memory/1656-8-0x00000000020D0000-0x00000000020D8000-memory.dmp

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memory/1656-9-0x0000000002160000-0x0000000002168000-memory.dmp

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memory/1656-2-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

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memory/1656-26-0x000007FEF5750000-0x000007FEF613C000-memory.dmp

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memory/1656-1-0x00000000000B0000-0x0000000000302000-memory.dmp

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memory/1872-30-0x0000000000C80000-0x0000000000ED2000-memory.dmp

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memory/1872-31-0x0000000000C60000-0x0000000000C72000-memory.dmp

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