dcrat | 85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867

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 1 IoCs

Detects payload of DCRat, commonly dropped by NSIS installers.

rat

resource	yara_rule
behavioral2/memory/1404-11-0x0000000000400000-0x00000000004B6000-memory.dmp	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-1-5-21-984744499-3605095035-265325720-1000\Control Panel\International\Geo\Nation	85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe

Executes dropped EXE 1 IoCs

pid	Process
4436	Yammi_Loader.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4436 set thread context of 1404	4436	Yammi_Loader.exe	109

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
1404	AppLaunch.exe
1404	AppLaunch.exe
1404	AppLaunch.exe
1404	AppLaunch.exe
1404	AppLaunch.exe
1404	AppLaunch.exe
1404	AppLaunch.exe
1404	AppLaunch.exe
1404	AppLaunch.exe
1404	AppLaunch.exe
1404	AppLaunch.exe
1404	AppLaunch.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1404	AppLaunch.exe

Suspicious use of WriteProcessMemory 19 IoCs

description	pid	Process	procid_target
PID 4228 wrote to memory of 4436	4228	85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe	91
PID 4228 wrote to memory of 4436	4228	85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe	91
PID 4228 wrote to memory of 4436	4228	85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe	91
PID 4436 wrote to memory of 1404	4436	Yammi_Loader.exe	109
PID 4436 wrote to memory of 1404	4436	Yammi_Loader.exe	109
PID 4436 wrote to memory of 1404	4436	Yammi_Loader.exe	109
PID 4436 wrote to memory of 1404	4436	Yammi_Loader.exe	109
PID 4436 wrote to memory of 1404	4436	Yammi_Loader.exe	109
PID 4436 wrote to memory of 1404	4436	Yammi_Loader.exe	109
PID 4436 wrote to memory of 1404	4436	Yammi_Loader.exe	109
PID 4436 wrote to memory of 1404	4436	Yammi_Loader.exe	109
PID 1404 wrote to memory of 2748	1404	AppLaunch.exe	111
PID 1404 wrote to memory of 2748	1404	AppLaunch.exe	111
PID 1404 wrote to memory of 2748	1404	AppLaunch.exe	111
PID 2748 wrote to memory of 4312	2748	cmd.exe	113
PID 2748 wrote to memory of 4312	2748	cmd.exe	113
PID 2748 wrote to memory of 4312	2748	cmd.exe	113
PID 4312 wrote to memory of 4964	4312	w32tm.exe	114
PID 4312 wrote to memory of 4964	4312	w32tm.exe	114

C:\Users\Admin\AppData\Local\Temp\85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe
"C:\Users\Admin\AppData\Local\Temp\85e2f958f1c6843f13f7dfedf4b907168d91f33828ad4d220f9e6022c3945867.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4228
- C:\Yammi_Loader.exe
  "C:\Yammi_Loader.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - Suspicious use of WriteProcessMemory
  PID:4436
- - 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:1404
  - - C:\Windows\SysWOW64\cmd.exe
      C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\CQmJXtxcMW.bat" "
      4⤵
      Suspicious use of WriteProcessMemory
      PID:2748
    - - C:\Windows\SysWOW64\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        5⤵
        Suspicious use of WriteProcessMemory
        
        PID:4312
      - C:\Windows\system32\w32tm.exe
        
        w32tm /stripchart /computer:localhost /period:5 /dataonly /samples:2
        6⤵
        
        PID:4964

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
228B

MD5
526df9a4c49c13cec115cd7fa6ebc1b1

SHA1
035f0ef8d044066770fc028431a6e27ad17acd08

SHA256
4a081a9b6ccbd4349954c2145a08cf7ff0ff07c267c3250e1c024150fc77258c

SHA512
eb8c626af8559d083a223892c7b7d283a18f433737021bfbcc71e93944e9b736bd716540acdc6f84f98c950df59512e71857734560f8c76b14d7b80daba87790

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
C:\Yammi_Loader.exe

Filesize
1.7MB

MD5
c91f1703dc916f794558bf40b5eab38a

SHA1
c020666495cb42db82515abae7cf35ca419636e9

SHA256
7bb4158925b3b225dbc69d2befa9cd3f9afe5ef6cf71fb581879e9df5659c5b6

SHA512
e345c1b4c4249cb8bc69d661564bfe9da8ee860f23e48d10d09256cd215483caf5b144040d490d43846d70e8e872b8b730dc134eda357a4e2a80991a435a6699

Download Submit
memory/1404-16-0x0000000005B30000-0x0000000005B80000-memory.dmp

Filesize
320KB

Download
memory/1404-13-0x0000000005280000-0x0000000005290000-memory.dmp

Filesize
64KB

Download
memory/1404-14-0x0000000005DB0000-0x0000000006354000-memory.dmp

Filesize
5.6MB

Download
memory/1404-15-0x0000000005950000-0x000000000596C000-memory.dmp

Filesize
112KB

Download
memory/1404-12-0x0000000074FD0000-0x0000000075780000-memory.dmp

Filesize
7.7MB

Download
memory/1404-17-0x0000000005980000-0x0000000005996000-memory.dmp

Filesize
88KB

Download
memory/1404-18-0x0000000005B00000-0x0000000005B0E000-memory.dmp

Filesize
56KB

Download
memory/1404-19-0x0000000005BF0000-0x0000000005C56000-memory.dmp

Filesize
408KB

Download
memory/1404-20-0x0000000074FD0000-0x0000000075780000-memory.dmp

Filesize
7.7MB

Download
memory/1404-21-0x0000000005280000-0x0000000005290000-memory.dmp

Filesize
64KB

Download
memory/1404-22-0x0000000006860000-0x00000000068F2000-memory.dmp

Filesize
584KB

Download
memory/1404-55-0x0000000074FD0000-0x0000000075780000-memory.dmp

Filesize
7.7MB

Download
memory/1404-11-0x0000000000400000-0x00000000004B6000-memory.dmp

Filesize
728KB

Download

Analysis

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