dcrat | 85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867

Analysis

max time kernel
118s
max time network
122s
platform
windows7_x64
resource
win7-20231025-en
resource tags

arch:x64arch:x86image:win7-20231025-enlocale:en-usos:windows7-x64system
submitted
19/11/2023, 12:58

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General

Target

85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe
Size

2.0MB
MD5

30187293127241c047ea7582cb3ba925
SHA1

70e9d100311fcfd66e344f8a71bc1e019c3de94e
SHA256

85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867
SHA512

54f3a665d89e760f012847756ffdae0727af0617e67ae3aad59f76ce6e1e7c67ce20f52203237453a7d21f5f175f9c98281075fb182b29af4a1538312e3abd04
SSDEEP

49152:nILNq8KKtRL4wk8UGHZF1ljvfvQAzjsKMvojOCIoBEScdD:nxKtRL47iPljJfsKDN7aScl

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

DCRat payload 6 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral1/memory/2860-16-0x0000000000400000-0x00000000004B6000-memory.dmp	dcrat
behavioral1/memory/2860-17-0x0000000000400000-0x00000000004B6000-memory.dmp	dcrat
behavioral1/memory/2860-19-0x0000000000400000-0x00000000004B6000-memory.dmp	dcrat
behavioral1/memory/2860-21-0x0000000000400000-0x00000000004B6000-memory.dmp	dcrat
behavioral1/memory/2860-23-0x0000000000400000-0x00000000004B6000-memory.dmp	dcrat
behavioral1/memory/2860-47-0x0000000004BD0000-0x0000000004C10000-memory.dmp	dcrat

Executes dropped EXE 1 IoCs

pid	Process
2924	Yammi_Loader.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2924 set thread context of 2860	2924	Yammi_Loader.exe	32

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
2860	AppLaunch.exe
2860	AppLaunch.exe
2860	AppLaunch.exe
2860	AppLaunch.exe
2860	AppLaunch.exe
2860	AppLaunch.exe
2860	AppLaunch.exe
2860	AppLaunch.exe
2860	AppLaunch.exe
2860	AppLaunch.exe
2860	AppLaunch.exe
2860	AppLaunch.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	2860	AppLaunch.exe

Suspicious use of WriteProcessMemory 34 IoCs

description	pid	Process	procid_target
PID 1980 wrote to memory of 2924	1980	85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe	28
PID 1980 wrote to memory of 2924	1980	85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe	28
PID 1980 wrote to memory of 2924	1980	85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe	28
PID 1980 wrote to memory of 2924	1980	85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe	28
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2924 wrote to memory of 2860	2924	Yammi_Loader.exe	32
PID 2860 wrote to memory of 1224	2860	AppLaunch.exe	34
PID 2860 wrote to memory of 1224	2860	AppLaunch.exe	34
PID 2860 wrote to memory of 1224	2860	AppLaunch.exe	34
PID 2860 wrote to memory of 1224	2860	AppLaunch.exe	34
PID 2860 wrote to memory of 1224	2860	AppLaunch.exe	34
PID 2860 wrote to memory of 1224	2860	AppLaunch.exe	34
PID 2860 wrote to memory of 1224	2860	AppLaunch.exe	34
PID 1224 wrote to memory of 764	1224	cmd.exe	36
PID 1224 wrote to memory of 764	1224	cmd.exe	36
PID 1224 wrote to memory of 764	1224	cmd.exe	36
PID 1224 wrote to memory of 764	1224	cmd.exe	36
PID 1224 wrote to memory of 764	1224	cmd.exe	36
PID 1224 wrote to memory of 764	1224	cmd.exe	36
PID 1224 wrote to memory of 764	1224	cmd.exe	36
PID 764 wrote to memory of 548	764	w32tm.exe	37
PID 764 wrote to memory of 548	764	w32tm.exe	37
PID 764 wrote to memory of 548	764	w32tm.exe	37
PID 764 wrote to memory of 548	764	w32tm.exe	37

C:\Users\Admin\AppData\Local\Temp\85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe
"C:\Users\Admin\AppData\Local\Temp\85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1980
- C:\Yammi_Loader.exe
  "C:\Yammi_Loader.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:2924
- - C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe
    "C:\Windows\Microsoft.NET\Framework\v4.0.30319\AppLaunch.exe"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:2860
  - - C:\Windows\SysWOW64\cmd.exe
      cmd /c ""C:\Users\Admin\AppData\Local\Temp\n34s4lmFbW.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:1224
    - - C:\Windows\SysWOW64\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:764
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:548

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\n34s4lmFbW.bat

Filesize
228B

MD5
c49a2e8de0f6d8a14ac8804c605bef75

SHA1
c7b69325d296a310cab7d3e09e837a46f69dfd59

SHA256
b874ed4c85d7f4743a92d3fca2472f1c800092002a80f4be4c58ad200f781d57

SHA512
5b639cfa6440546ddfc4df556f5f0acec13ea2876ded99259386181b11046db0a3d00ca9c034845894eeede00de843ad96441c9f2004a01e67d34d036197b177

Download Submit
C:\Users\Admin\AppData\Local\Temp\n34s4lmFbW.bat

Filesize
228B

MD5
c49a2e8de0f6d8a14ac8804c605bef75

SHA1
c7b69325d296a310cab7d3e09e837a46f69dfd59

SHA256
b874ed4c85d7f4743a92d3fca2472f1c800092002a80f4be4c58ad200f781d57

SHA512
5b639cfa6440546ddfc4df556f5f0acec13ea2876ded99259386181b11046db0a3d00ca9c034845894eeede00de843ad96441c9f2004a01e67d34d036197b177

Download Submit
C:\Yammi_Loader.exe

Filesize
1.7MB

MD5
c91f1703dc916f794558bf40b5eab38a

SHA1
c020666495cb42db82515abae7cf35ca419636e9

SHA256
7bb4158925b3b225dbc69d2befa9cd3f9afe5ef6cf71fb581879e9df5659c5b6

SHA512
e345c1b4c4249cb8bc69d661564bfe9da8ee860f23e48d10d09256cd215483caf5b144040d490d43846d70e8e872b8b730dc134eda357a4e2a80991a435a6699

Download Submit
C:\Yammi_Loader.exe

Filesize
1.7MB

MD5
c91f1703dc916f794558bf40b5eab38a

SHA1
c020666495cb42db82515abae7cf35ca419636e9

SHA256
7bb4158925b3b225dbc69d2befa9cd3f9afe5ef6cf71fb581879e9df5659c5b6

SHA512
e345c1b4c4249cb8bc69d661564bfe9da8ee860f23e48d10d09256cd215483caf5b144040d490d43846d70e8e872b8b730dc134eda357a4e2a80991a435a6699

Download Submit
memory/2860-24-0x00000000748B0000-0x0000000074F9E000-memory.dmp

Filesize
6.9MB

Download
memory/2860-25-0x0000000004BD0000-0x0000000004C10000-memory.dmp

Filesize
256KB

Download
memory/2860-18-0x00000000FFFDE000-0x00000000FFFDF000-memory.dmp

Filesize
4KB

Download
memory/2860-19-0x0000000000400000-0x00000000004B6000-memory.dmp

Filesize
728KB

Download
memory/2860-21-0x0000000000400000-0x00000000004B6000-memory.dmp

Filesize
728KB

Download
memory/2860-23-0x0000000000400000-0x00000000004B6000-memory.dmp

Filesize
728KB

Download
memory/2860-16-0x0000000000400000-0x00000000004B6000-memory.dmp

Filesize
728KB

Download
memory/2860-17-0x0000000000400000-0x00000000004B6000-memory.dmp

Filesize
728KB

Download
memory/2860-26-0x0000000000980000-0x000000000099C000-memory.dmp

Filesize
112KB

Download
memory/2860-27-0x00000000009A0000-0x00000000009B6000-memory.dmp

Filesize
88KB

Download
memory/2860-28-0x00000000009C0000-0x00000000009CE000-memory.dmp

Filesize
56KB

Download
memory/2860-29-0x00000000748B0000-0x0000000074F9E000-memory.dmp

Filesize
6.9MB

Download
memory/2860-47-0x0000000004BD0000-0x0000000004C10000-memory.dmp

Filesize
256KB

Download
memory/2860-15-0x0000000000400000-0x00000000004B6000-memory.dmp

Filesize
728KB

Download
memory/2860-14-0x0000000000400000-0x00000000004B6000-memory.dmp

Filesize
728KB

Download
memory/2860-59-0x00000000748B0000-0x0000000074F9E000-memory.dmp

Filesize
6.9MB

Download