dcrat | 6ab0890a2aedb8d21048be3cb8fcaf6ba8fe22d418fec483bdba53e68ab430f6

Analysis

max time kernel
135s
max time network
146s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
27/02/2024, 13:21

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General

Target
2c03d2d911694cd33c23b0edafd33ff0.exe
Size 3.1MB
Sample240227-qlpgcaac8y
SHA256 6ab0890a2aedb8d21048be3cb8fcaf6ba8fe22d418fec483bdba53e68ab430f6
MD5 2c03d2d911694cd33c23b0edafd33ff0
SHA1 c16efb40930aec5b7f894b78f9b6f04bfc03fa0f
SHA512 b02b123bfb5d5ef55820315887ceecbdb4ecdc50f7af241a9b6b722baedcce0b6441e1553d1ccbc85b091ac84c1c4801d8cdcc291575d8a4dc1afa974fc76dee
SSDEEP 49152:xp70LTonM7JrVV+t8Z6e8hyF9kdrq8ChhGpg2U/KQ7d5tQX:gfonMdBVZYyjACh0DUB71
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	2144	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2712	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2748	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2292	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	552	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2588	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2456	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2564	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2540	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2440	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2492	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2480	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1280	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2232	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2648	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2792	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2812	2612	schtasks.exe	28
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2832	2612	schtasks.exe	28

DCRat payload 5 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/1684-0-0x0000000000390000-0x00000000006B4000-memory.dmp	dcrat
behavioral1/files/0x0006000000015ca6-11.dat	dcrat
behavioral1/files/0x0007000000014726-20.dat	dcrat
behavioral1/files/0x0007000000014726-19.dat	dcrat
behavioral1/memory/2308-21-0x0000000000330000-0x0000000000654000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
2308	smss.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Uninstall Information\smss.exe	2c03d2d911694cd33c23b0edafd33ff0.exe
File created	C:\Program Files (x86)\Uninstall Information\69ddcba757bf72	2c03d2d911694cd33c23b0edafd33ff0.exe

Drops file in Windows directory 2 IoCs

description	ioc	Process
File created	C:\Windows\debug\WIA\dllhost.exe	2c03d2d911694cd33c23b0edafd33ff0.exe
File created	C:\Windows\debug\WIA\5940a34987c991	2c03d2d911694cd33c23b0edafd33ff0.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
2440	schtasks.exe
2648	schtasks.exe
2812	schtasks.exe
2832	schtasks.exe
2144	schtasks.exe
2712	schtasks.exe
2540	schtasks.exe
2480	schtasks.exe
2232	schtasks.exe
552	schtasks.exe
2456	schtasks.exe
2492	schtasks.exe
1280	schtasks.exe
2792	schtasks.exe
2292	schtasks.exe
2564	schtasks.exe
2748	schtasks.exe
2588	schtasks.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
1684	2c03d2d911694cd33c23b0edafd33ff0.exe
1684	2c03d2d911694cd33c23b0edafd33ff0.exe
1684	2c03d2d911694cd33c23b0edafd33ff0.exe
2308	smss.exe
2308	smss.exe
2308	smss.exe
2308	smss.exe
2308	smss.exe
2308	smss.exe
2308	smss.exe
2308	smss.exe
2308	smss.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
2308	smss.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1684	2c03d2d911694cd33c23b0edafd33ff0.exe
Token: SeDebugPrivilege	2308	smss.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1684 wrote to memory of 2308	1684	2c03d2d911694cd33c23b0edafd33ff0.exe	47
PID 1684 wrote to memory of 2308	1684	2c03d2d911694cd33c23b0edafd33ff0.exe	47
PID 1684 wrote to memory of 2308	1684	2c03d2d911694cd33c23b0edafd33ff0.exe	47

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\2c03d2d911694cd33c23b0edafd33ff0.exe
"C:\Users\Admin\AppData\Local\Temp\2c03d2d911694cd33c23b0edafd33ff0.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:1684
- C:\Program Files (x86)\Uninstall Information\smss.exe
  "C:\Program Files (x86)\Uninstall Information\smss.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  PID:2308

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 5 /tr "'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2144

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrss" /sc ONLOGON /tr "'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2712

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "csrssc" /sc MINUTE /mo 10 /tr "'C:\MSOCache\All Users\{90140000-0117-0409-0000-0000000FF1CE}-C\Access.en-us\csrss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2748

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 13 /tr "'C:\Windows\debug\WIA\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2292

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\debug\WIA\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:552

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 14 /tr "'C:\Windows\debug\WIA\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2588

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 5 /tr "'C:\Program Files (x86)\Uninstall Information\smss.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2456

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smss" /sc ONLOGON /tr "'C:\Program Files (x86)\Uninstall Information\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2564

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "smsss" /sc MINUTE /mo 13 /tr "'C:\Program Files (x86)\Uninstall Information\smss.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2540

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhostd" /sc MINUTE /mo 14 /tr "'C:\Users\Admin\Desktop\dllhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2440

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dllhost" /sc ONLOGON /tr "'C:\Users\Admin\Desktop\dllhost.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 "dllhostd" /sc MINUTE /mo 8 /tr "'C:\Users\Admin\Desktop\dllhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2480

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 12 /tr "'C:\Recovery\5b7985c2-d100-11ee-bb00-c695cbc44580\dwm.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1280

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwm" /sc ONLOGON /tr "'C:\Recovery\5b7985c2-d100-11ee-bb00-c695cbc44580\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2232

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "dwmd" /sc MINUTE /mo 13 /tr "'C:\Recovery\5b7985c2-d100-11ee-bb00-c695cbc44580\dwm.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2648

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "IdleI" /sc MINUTE /mo 13 /tr "'C:\Users\Public\Documents\My Music\Idle.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2792

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "Idle" /sc ONLOGON /tr "'C:\Users\Public\Documents\My Music\Idle.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 "IdleI" /sc MINUTE /mo 11 /tr "'C:\Users\Public\Documents\My Music\Idle.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2832

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

smss.exe

Path C:\Program Files (x86)\Uninstall Information\smss.exe
Size 1.2MB
SHA256 ceda91b6d750f1e451c06c6c8c8896c64826d7c0e64e359d0692e2d9a91e95f3
MD5 666e5550b80681e32bfd5a0e6b59e521
SHA1 72dadc545f9d2e6b8dfd6362b3626d9be384a777
SHA512 e91ae82a0bf53d79c00198ecfc7d649b695ebdad7b561efce0ddf5f9b5c01b6cb0d9b0976375749cec4702eec038da92b7e0cf081c63e10d0d8001c39e0df69d
SSDEEP 24576:hfp7x21SD78LT/gnMbCz6Lfh3bwsJB6AKXuVLc898bV:xp70LTonM7JrVVG
MD5 SHA1 SHA512 SSDEEP

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smss.exe

Path C:\Program Files (x86)\Uninstall Information\smss.exe
Size 1.7MB
SHA256 c6149f69872235c96bc5dc31cbfeb52b6276ef4d8825964728ce500d4194b4f4
MD5 efa5b39fa8a09a5fdc86edefbfa50ee7
SHA1 f1b16655e68263bf2d76a97eaa2ddf86814e9f22
SHA512 73aa707d4bb1bfe19589d5c4a80638a96c115cedd3abc51def6558209b3aaf6b90a669f98fa93594e6bae23ab06a94a24831b1abf3bcb44fc779d0e8e8d3aa8d
SSDEEP 24576:hfp7x21SD78LT/gnMbCz6Lfh3bwsJB6AKXuVLc898bv5lbfZVfE9Z6eP0f:xp70LTonM7JrVV+t8Z6e8f
MD5 SHA1 SHA512 SSDEEP

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dwm.exe

Path C:\Recovery\5b7985c2-d100-11ee-bb00-c695cbc44580\dwm.exe
Size 3.1MB
SHA256 6ab0890a2aedb8d21048be3cb8fcaf6ba8fe22d418fec483bdba53e68ab430f6
MD5 2c03d2d911694cd33c23b0edafd33ff0
SHA1 c16efb40930aec5b7f894b78f9b6f04bfc03fa0f
SHA512 b02b123bfb5d5ef55820315887ceecbdb4ecdc50f7af241a9b6b722baedcce0b6441e1553d1ccbc85b091ac84c1c4801d8cdcc291575d8a4dc1afa974fc76dee
SSDEEP 49152:xp70LTonM7JrVV+t8Z6e8hyF9kdrq8ChhGpg2U/KQ7d5tQX:gfonMdBVZYyjACh0DUB71
MD5 SHA1 SHA512 SSDEEP

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memory/1684-0-0x0000000000390000-0x00000000006B4000-memory.dmp

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memory/1684-1-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

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memory/1684-2-0x000000001B2B0000-0x000000001B330000-memory.dmp

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memory/1684-23-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

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memory/2308-22-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

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memory/2308-21-0x0000000000330000-0x0000000000654000-memory.dmp

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memory/2308-24-0x000000001B3C0000-0x000000001B440000-memory.dmp

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memory/2308-25-0x000007FEF5FA0000-0x000007FEF698C000-memory.dmp

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memory/2308-26-0x000000001B3C0000-0x000000001B440000-memory.dmp

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