dcrat | ff8bcaa8c3a792db0f191e003d3c72a3dc532f849e2f495254c6252e5b61382c

Analysis

max time kernel
117s
max time network
160s
platform
windows10_x64
resource
win10v20210410
submitted
02/07/2021, 23:26

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General

Target
7B7D03AAD6DDB0E421AB5BBA1A796484.exe
Size 702KB
Sample210702-mmghvt4m5a
SHA256 ff8bcaa8c3a792db0f191e003d3c72a3dc532f849e2f495254c6252e5b61382c
MD5 7b7d03aad6ddb0e421ab5bba1a796484
SHA1 00d725c6694554a632902b9e0ba59efb849278d7
SHA512 05049989594a3636a79955cb174516a72a838d57456adbf85329002e089b7f28b5dd84c63f034c750b17500c16012729535e072b2c579326741c9d638c3670ad
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

DCRat Payload 2 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/files/0x000100000001ab99-128.dat	dcrat
behavioral2/files/0x000100000001ab99-129.dat	dcrat

Executes dropped EXE 1 IoCs

pid	Process
3408	dllhost.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
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials in Files
T1081

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
15	ipinfo.io
16	ipinfo.io

Drops file in System32 directory 12 IoCs

description	ioc	Process
File created	C:\Windows\System32\PING\5940a34987c99120d96dace90a3f93f329dcad63	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\GameUXLegacyGDFs\5940a34987c99120d96dace90a3f93f329dcad63	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\wbem\scersop\WMIADAP.exe	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\AppXDeploymentExtensions.desktop\fontdrvhost.exe	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\AppXDeploymentExtensions.desktop\5b884080fd4f94e2695da25c503f9e33b9605b83	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\GameUXLegacyGDFs\dllhost.exe	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\cfmifs\dllhost.exe	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\cfmifs\5940a34987c99120d96dace90a3f93f329dcad63	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\wbem\ntevt\WMIADAP.exe	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\wbem\ntevt\75a57c1bdf437c0c81ad56e81f43c7323ed35745	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\PING\dllhost.exe	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
File created	C:\Windows\System32\wbem\scersop\75a57c1bdf437c0c81ad56e81f43c7323ed35745	7B7D03AAD6DDB0E421AB5BBA1A796484.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 10 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
1940	schtasks.exe
4052	schtasks.exe
2948	schtasks.exe
1296	schtasks.exe
3464	schtasks.exe
2152	schtasks.exe
3956	schtasks.exe
3752	schtasks.exe
3976	schtasks.exe
2088	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
3408	dllhost.exe
3408	dllhost.exe
3408	dllhost.exe

Suspicious behavior: GetForegroundWindowSpam 1 IoCs

pid	Process
3408	dllhost.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe
Token: SeDebugPrivilege	3408	dllhost.exe

Suspicious use of WriteProcessMemory 22 IoCs

description	pid	Process	procid_target
PID 3212 wrote to memory of 3752	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	77
PID 3212 wrote to memory of 3752	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	77
PID 3212 wrote to memory of 1296	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	80
PID 3212 wrote to memory of 1296	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	80
PID 3212 wrote to memory of 3464	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	82
PID 3212 wrote to memory of 3464	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	82
PID 3212 wrote to memory of 3976	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	84
PID 3212 wrote to memory of 3976	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	84
PID 3212 wrote to memory of 2152	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	86
PID 3212 wrote to memory of 2152	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	86
PID 3212 wrote to memory of 2088	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	88
PID 3212 wrote to memory of 2088	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	88
PID 3212 wrote to memory of 1940	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	90
PID 3212 wrote to memory of 1940	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	90
PID 3212 wrote to memory of 4052	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	92
PID 3212 wrote to memory of 4052	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	92
PID 3212 wrote to memory of 3956	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	94
PID 3212 wrote to memory of 3956	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	94
PID 3212 wrote to memory of 2948	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	96
PID 3212 wrote to memory of 2948	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	96
PID 3212 wrote to memory of 3408	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	98
PID 3212 wrote to memory of 3408	3212	7B7D03AAD6DDB0E421AB5BBA1A796484.exe	98

C:\Users\Admin\AppData\Local\Temp\7B7D03AAD6DDB0E421AB5BBA1A796484.exe
"C:\Users\Admin\AppData\Local\Temp\7B7D03AAD6DDB0E421AB5BBA1A796484.exe"
1⤵
- Drops file in System32 directory
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:3212
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "7B7D03AAD6DDB0E421AB5BBA1A796484" /sc ONLOGON /tr "'C:\Users\Admin\AppData\Local\Temp\Microsoft .NET Framework 4.7.2 Setup_20210410_070720666\7B7D03AAD6DDB0E421AB5BBA1A796484.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:3752
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\odt\fontdrvhost.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1296
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\cfmifs\dllhost.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:3464
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "Idle" /sc ONLOGON /tr "'C:\PerfLogs\Idle.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:3976
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "WMIADAP" /sc ONLOGON /tr "'C:\Windows\System32\wbem\ntevt\WMIADAP.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2152
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\PING\dllhost.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2088
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "fontdrvhost" /sc ONLOGON /tr "'C:\Windows\System32\AppXDeploymentExtensions.desktop\fontdrvhost.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:1940
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Windows\System32\GameUXLegacyGDFs\dllhost.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:4052
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "WMIADAP" /sc ONLOGON /tr "'C:\Windows\System32\wbem\scersop\WMIADAP.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:3956
- C:\Windows\SYSTEM32\schtasks.exe
  "schtasks" /create /tn "dllhost" /sc ONLOGON /tr "'C:\Recovery\WindowsRE\dllhost.exe'" /rl HIGHEST /f
  2⤵
  - Creates scheduled task(s)
  PID:2948
- C:\Windows\System32\cfmifs\dllhost.exe
  "C:\Windows\System32\cfmifs\dllhost.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious behavior: GetForegroundWindowSpam
  - Suspicious use of AdjustPrivilegeToken
  PID:3408

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

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

memory/3212-114-0x00000000004C0000-0x00000000004C1000-memory.dmp

Download

memory/3212-120-0x000000001B210000-0x000000001B212000-memory.dmp

Download

memory/3408-139-0x000000001ECC0000-0x000000001ECC1000-memory.dmp

Download

memory/3408-143-0x000000001FFE0000-0x000000001FFE1000-memory.dmp

Download

memory/3408-142-0x000000001B795000-0x000000001B797000-memory.dmp

Download

memory/3408-141-0x000000001B792000-0x000000001B794000-memory.dmp

Download

memory/3408-140-0x000000001B794000-0x000000001B795000-memory.dmp

Download

memory/3408-132-0x000000001B790000-0x000000001B792000-memory.dmp

Download

memory/3408-133-0x00000000012D0000-0x00000000012D6000-memory.dmp

Download

memory/3408-134-0x00000000012C0000-0x00000000012C7000-memory.dmp

Download

memory/3408-135-0x00000000012B0000-0x00000000012B6000-memory.dmp

Download

memory/3408-136-0x0000000002AE0000-0x0000000002AE5000-memory.dmp

Download

memory/3408-137-0x0000000001300000-0x0000000001302000-memory.dmp

Download

memory/3408-138-0x0000000002AC0000-0x0000000002AC2000-memory.dmp

Download