dcrat | 87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01

General

Target
87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
Size 828KB
Sample240601-bmvmesdc34
SHA256 87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01
MD5 49b61d151699e4fa7e5530b05455450e
SHA1 6c292332561fdbd00163b45bdf8f3eee737fadee
SHA512 19ac471f2ff96c09030fd453008cc9744259280af43e87a01329b3378a263ad49ead6c0f4ca14a4223623f7fda116cea8f1f10fdac4cff100c037891059860bd
SSDEEP 12288:ql20oWgRNeR1k5u5cKO6bnfk2jyFdXYygXQARV/pJ:qlqR8R1l5cKvbdjyFdYytg/pJ
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 9 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	4912	5076	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3320	5076	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	3944	5076	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	116	5076	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1056	5076	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1148	5076	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	2228	5076	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	372	5076	schtasks.exe	82
Parent C:\Windows\system32\wbem\wmiprvse.exe is not expected to spawn this process	1676	5076	schtasks.exe	82

DCRat payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/1832-0-0x00000000008C0000-0x0000000000996000-memory.dmp	dcrat
behavioral2/files/0x0007000000023492-10.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-1-5-21-3571316656-3665257725-2415531812-1000\Control Panel\International\Geo\Nation	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe

Executes dropped EXE 1 IoCs

pid	Process
1852	fontdrvhost.exe

Drops file in Program Files directory 2 IoCs

description	ioc	Process
File created	C:\Program Files (x86)\Windows Sidebar\Gadgets\taskhostw.exe	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
File created	C:\Program Files (x86)\Windows Sidebar\Gadgets\ea9f0e6c9e2dcd	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe

Drops file in Windows directory 3 IoCs

description	ioc	Process
File created	C:\Windows\bcastdvr\upfc.exe	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
File opened for modification	C:\Windows\bcastdvr\upfc.exe	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
File created	C:\Windows\bcastdvr\ea1d8f6d871115	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.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 9 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
4912	schtasks.exe
3320	schtasks.exe
3944	schtasks.exe
1148	schtasks.exe
2228	schtasks.exe
1676	schtasks.exe
116	schtasks.exe
1056	schtasks.exe
372	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1832	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
1832	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
1832	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
1832	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
1832	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
1852	fontdrvhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1832	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
Token: SeDebugPrivilege	1852	fontdrvhost.exe

Suspicious use of WriteProcessMemory 2 IoCs

description	pid	Process	procid_target
PID 1832 wrote to memory of 1852	1832	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe	92
PID 1832 wrote to memory of 1852	1832	87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe	92

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\87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.exe
"C:\Users\Admin\AppData\Local\Temp\87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01.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:1832
- C:\Users\Default\fontdrvhost.exe
  "C:\Users\Default\fontdrvhost.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1852

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 5 /tr "'C:\Windows\bcastdvr\upfc.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:4912

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfc" /sc ONLOGON /tr "'C:\Windows\bcastdvr\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3320

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "upfcu" /sc MINUTE /mo 12 /tr "'C:\Windows\bcastdvr\upfc.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:3944

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 14 /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\taskhostw.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:116

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostw" /sc ONLOGON /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1056

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "taskhostwt" /sc MINUTE /mo 11 /tr "'C:\Program Files (x86)\Windows Sidebar\Gadgets\taskhostw.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1148

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 7 /tr "'C:\Users\Default\fontdrvhost.exe'" /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:2228

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Users\Default\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:372

C:\Windows\system32\schtasks.exe
schtasks.exe /create /tn "fontdrvhostf" /sc MINUTE /mo 14 /tr "'C:\Users\Default\fontdrvhost.exe'" /rl HIGHEST /f
1⤵
- Process spawned unexpected child process
- Creates scheduled task(s)
PID:1676

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

1

T1053

Persistence

Scheduled Task/Job

1

T1053

Privilege Escalation

Scheduled Task/Job

1

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

fontdrvhost.exe

Path C:\Users\Default\fontdrvhost.exe
Size 828KB
SHA256 87aabada24265836ba604a2b3e8f37a0384ae01cae3554e2bbb0688200e27d01
MD5 49b61d151699e4fa7e5530b05455450e
SHA1 6c292332561fdbd00163b45bdf8f3eee737fadee
SHA512 19ac471f2ff96c09030fd453008cc9744259280af43e87a01329b3378a263ad49ead6c0f4ca14a4223623f7fda116cea8f1f10fdac4cff100c037891059860bd
SSDEEP 12288:ql20oWgRNeR1k5u5cKO6bnfk2jyFdXYygXQARV/pJ:qlqR8R1l5cKvbdjyFdYytg/pJ
MD5 SHA1 SHA512 SSDEEP

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memory/1832-1-0x00007FFA87983000-0x00007FFA87985000-memory.dmp

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memory/1832-0-0x00000000008C0000-0x0000000000996000-memory.dmp

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memory/1832-4-0x00007FFA87980000-0x00007FFA88441000-memory.dmp

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memory/1832-20-0x00007FFA87980000-0x00007FFA88441000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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