dcrat | 673d075938eeef4f6a0b24c6939730604f431bd6cbdb1f9c5177ecb1a97c5e4f

Analysis

max time kernel
150s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20220721-en
resource tags

arch:x64arch:x86image:win10v2004-20220721-enlocale:en-usos:windows10-2004-x64system
submitted
10/08/2022, 17:16

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General

Target
35ee1e77962200770658ab5ce3d06244.exe
Size 1.6MB
Sample220810-vs4xtseha5
SHA256 673d075938eeef4f6a0b24c6939730604f431bd6cbdb1f9c5177ecb1a97c5e4f
MD5 35ee1e77962200770658ab5ce3d06244
SHA1 d70700b9b65239930ca0993a75b68a1529b987a9
SHA512 9b53a0183231bf95f7838814e71b5ed90d99b1d0167ea3b0b0a4b4b12210b467e637333ea8ca2944b02c15b69881d99ce5da0d341fdfabc55bbf6b2061cbbc69
MD5 SHA1 SHA512

Score

10^/10

dcrat infostealer rat spyware stealer

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 12 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	1012	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2276	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1708	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3528	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3772	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2524	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2236	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1052	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2664	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	672	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3984	2240	schtasks.exe	41
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1872	2240	schtasks.exe	41

DCRat payload 5 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/4988-131-0x0000000000440000-0x00000000008AE000-memory.dmp	dcrat
behavioral2/memory/4988-139-0x0000000000440000-0x00000000008AE000-memory.dmp	dcrat
behavioral2/memory/216-144-0x0000000000280000-0x00000000006EE000-memory.dmp	dcrat
behavioral2/memory/216-146-0x0000000000280000-0x00000000006EE000-memory.dmp	dcrat
behavioral2/memory/216-147-0x0000000000280000-0x00000000006EE000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
216	backgroundTaskHost.exe

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-1-5-21-2372564722-193526734-2636556182-1000\Control Panel\International\Geo\Nation	35ee1e77962200770658ab5ce3d06244.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials in Files
T1081

Suspicious use of NtSetInformationThreadHideFromDebugger 17 IoCs

pid	Process
4988	35ee1e77962200770658ab5ce3d06244.exe
4988	35ee1e77962200770658ab5ce3d06244.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe

Drops file in Program Files directory 7 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Windows Photo Viewer\fr-FR\5b884080fd4f94	35ee1e77962200770658ab5ce3d06244.exe
File created	C:\Program Files\Internet Explorer\csrss.exe	35ee1e77962200770658ab5ce3d06244.exe
File opened for modification	C:\Program Files\Internet Explorer\csrss.exe	35ee1e77962200770658ab5ce3d06244.exe
File created	C:\Program Files\Internet Explorer\886983d96e3d3e	35ee1e77962200770658ab5ce3d06244.exe
File created	C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\sihost.exe	35ee1e77962200770658ab5ce3d06244.exe
File created	C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\66fc9ff0ee96c2	35ee1e77962200770658ab5ce3d06244.exe
File created	C:\Program Files (x86)\Windows Photo Viewer\fr-FR\fontdrvhost.exe	35ee1e77962200770658ab5ce3d06244.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\ServiceProfiles\LocalService\Music\backgroundTaskHost.exe	35ee1e77962200770658ab5ce3d06244.exe
File created	C:\Windows\ServiceProfiles\LocalService\Music\eddb19405b7ce1	35ee1e77962200770658ab5ce3d06244.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 12 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
3528	schtasks.exe
2524	schtasks.exe
2236	schtasks.exe
3984	schtasks.exe
1872	schtasks.exe
1012	schtasks.exe
2276	schtasks.exe
1708	schtasks.exe
3772	schtasks.exe
1052	schtasks.exe
2664	schtasks.exe
672	schtasks.exe

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2372564722-193526734-2636556182-1000_Classes\Local Settings	35ee1e77962200770658ab5ce3d06244.exe

Suspicious behavior: EnumeratesProcesses 14 IoCs

pid	Process
4988	35ee1e77962200770658ab5ce3d06244.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe
216	backgroundTaskHost.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
216	backgroundTaskHost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	4988	35ee1e77962200770658ab5ce3d06244.exe
Token: SeDebugPrivilege	216	backgroundTaskHost.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
4988	35ee1e77962200770658ab5ce3d06244.exe
216	backgroundTaskHost.exe

Suspicious use of WriteProcessMemory 11 IoCs

description	pid	Process	procid_target
PID 4988 wrote to memory of 3832	4988	35ee1e77962200770658ab5ce3d06244.exe	93
PID 4988 wrote to memory of 3832	4988	35ee1e77962200770658ab5ce3d06244.exe	93
PID 4988 wrote to memory of 3832	4988	35ee1e77962200770658ab5ce3d06244.exe	93
PID 3832 wrote to memory of 3384	3832	cmd.exe	95
PID 3832 wrote to memory of 3384	3832	cmd.exe	95
PID 3832 wrote to memory of 3384	3832	cmd.exe	95
PID 3384 wrote to memory of 3104	3384	w32tm.exe	96
PID 3384 wrote to memory of 3104	3384	w32tm.exe	96
PID 3832 wrote to memory of 216	3832	cmd.exe	97
PID 3832 wrote to memory of 216	3832	cmd.exe	97
PID 3832 wrote to memory of 216	3832	cmd.exe	97

C:\Users\Admin\AppData\Local\Temp\35ee1e77962200770658ab5ce3d06244.exe
"C:\Users\Admin\AppData\Local\Temp\35ee1e77962200770658ab5ce3d06244.exe"
1⤵
- Checks computer location settings
- Suspicious use of NtSetInformationThreadHideFromDebugger
- Drops file in Program Files directory
- Drops file in Windows directory
- Modifies registry class
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:4988
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C "C:\Users\Admin\AppData\Local\Temp\Rrmz8zjfkA.bat"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:3832
- - C:\Windows\SysWOW64\w32tm.exe
    w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:3384
  - - C:\Windows\system32\w32tm.exe
      w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
      4⤵
      PID:3104
- - C:\Windows\ServiceProfiles\LocalService\Music\backgroundTaskHost.exe
    "C:\Windows\ServiceProfiles\LocalService\Music\backgroundTaskHost.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of NtSetInformationThreadHideFromDebugger
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious behavior: GetForegroundWindowSpam
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:216

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 9 /tr "'C:\Program Files\Internet Explorer\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1012

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\Program Files\Internet Explorer\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2276

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\Program Files\Internet Explorer\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1708

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 8 /tr "'C:\Windows\ServiceProfiles\LocalService\Music\backgroundTaskHost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3528

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHost" /sc ONLOGON /tr "'C:\Windows\ServiceProfiles\LocalService\Music\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3772

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "backgroundTaskHostb" /sc MINUTE /mo 10 /tr "'C:\Windows\ServiceProfiles\LocalService\Music\backgroundTaskHost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2524

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\sihost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2236

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihost" /sc ONLOGON /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1052

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "sihosts" /sc MINUTE /mo 9 /tr "'C:\Program Files (x86)\Microsoft.NET\Primary Interop Assemblies\sihost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2664

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Windows Photo Viewer\fr-FR\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:672

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Photo Viewer\fr-FR\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3984

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Photo Viewer\fr-FR\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1872

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

Rrmz8zjfkA.bat

Path C:\Users\Admin\AppData\Local\Temp\Rrmz8zjfkA.bat
Size 233B
SHA256 380fb05bc24f4edf07260634444333f03cbf1adba47fde61c23a99a12e4d0465
MD5 a52a8fe4fa1e953f027cb3bb464a32c8
SHA1 c5450a4f7a6c877233938cef15d48eca581a9a0f
SHA512 8a99badfd2e50ecfcae04329ee4355b85b5ec7b8772f1f64bd7dd9210fb75c2873f039005c9aaae6e0398803b89208b2fb90f6a307a48ffd2ddbf1dbb965b86b
MD5 SHA1 SHA512

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backgroundTaskHost.exe

Path C:\Windows\ServiceProfiles\LocalService\Music\backgroundTaskHost.exe
Size 1.6MB
SHA256 673d075938eeef4f6a0b24c6939730604f431bd6cbdb1f9c5177ecb1a97c5e4f
MD5 35ee1e77962200770658ab5ce3d06244
SHA1 d70700b9b65239930ca0993a75b68a1529b987a9
SHA512 9b53a0183231bf95f7838814e71b5ed90d99b1d0167ea3b0b0a4b4b12210b467e637333ea8ca2944b02c15b69881d99ce5da0d341fdfabc55bbf6b2061cbbc69
SSDEEP 49152:X9W4iylDW8dFR9Af2VYtQN/VVWQf08GMu:tWlylD3PA+O+BVHf8
MD5 SHA1 SHA512 SSDEEP

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backgroundTaskHost.exe

Path C:\Windows\ServiceProfiles\LocalService\Music\backgroundTaskHost.exe
Size 1.6MB
SHA256 673d075938eeef4f6a0b24c6939730604f431bd6cbdb1f9c5177ecb1a97c5e4f
MD5 35ee1e77962200770658ab5ce3d06244
SHA1 d70700b9b65239930ca0993a75b68a1529b987a9
SHA512 9b53a0183231bf95f7838814e71b5ed90d99b1d0167ea3b0b0a4b4b12210b467e637333ea8ca2944b02c15b69881d99ce5da0d341fdfabc55bbf6b2061cbbc69
SSDEEP 49152:X9W4iylDW8dFR9Af2VYtQN/VVWQf08GMu:tWlylD3PA+O+BVHf8
MD5 SHA1 SHA512 SSDEEP

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memory/216-147-0x0000000000280000-0x00000000006EE000-memory.dmp

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memory/216-146-0x0000000000280000-0x00000000006EE000-memory.dmp

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memory/216-144-0x0000000000280000-0x00000000006EE000-memory.dmp

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memory/216-145-0x0000000000280000-0x00000000006EE000-memory.dmp

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memory/4988-134-0x0000000006AA0000-0x0000000006B32000-memory.dmp

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memory/4988-139-0x0000000000440000-0x00000000008AE000-memory.dmp

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memory/4988-135-0x0000000007C90000-0x0000000007CF6000-memory.dmp

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memory/4988-130-0x0000000000440000-0x00000000008AE000-memory.dmp

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memory/4988-133-0x00000000062A0000-0x00000000062F0000-memory.dmp

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memory/4988-132-0x0000000006450000-0x00000000069F4000-memory.dmp

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memory/4988-131-0x0000000000440000-0x00000000008AE000-memory.dmp

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