darkcomet | b7b1d2292495b26c07ace69d9b563e99f1f6125408085864b6fb2e172c4975fb

General

Target

b59f41b2e13be96995081ede3b5448ea_JaffaCakes118.exe
Size

585KB
MD5

b59f41b2e13be96995081ede3b5448ea
SHA1

7b824a918d04b6a01c98d2960c93baa93496031a
SHA256

b7b1d2292495b26c07ace69d9b563e99f1f6125408085864b6fb2e172c4975fb
SHA512

4f1eae4963fa07bdb107e8461804e0bb7b11b99faef81a4ee1a5ba67a115c422585c1431f3927f7b6a67a3336900aacac8244b48410a0dca8d5129bb8af4c9ec
SSDEEP

12288:K84skkP1VHr+d/yyrnMdYJpAsbaNSQDLV2yN+B0p8ol:ZkiPI/tbMdSasbaw4kyNug

Score

10^/10

darkcomet guest16 discovery persistence rat trojan

Malware Config

Extracted

Family

darkcomet

Botnet

Guest16

C2

crossfirenp.no-ip.org:1604

Mutex

DC_MUTEX-Y8TYL43

Attributes

InstallPath
MSDCSC\msdcsc.exe
gencode
o3Lo08H6R2fU
install
true
offline_keylogger
true
persistence
false
reg_key
MicroUpdate

Signatures

Darkcomet
DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.
trojan rat darkcomet
Darkcomet family
darkcomet

Modifies WinLogon for persistence 2 TTPs 1 IoCs

persistence

Winlogon Helper DLL

T1547.004

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\UserInit = "C:\\Windows\\system32\\userinit.exe,C:\\Users\\Admin\\Documents\\MSDCSC\\msdcsc.exe"	vbc.exe

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-1-5-21-4050598569-1597076380-177084960-1000\Control Panel\International\Geo\Nation	b59f41b2e13be96995081ede3b5448ea_JaffaCakes118.exe

Executes dropped EXE 2 IoCs

pid	Process
1072	cryptedserver.exe
3200	msdcsc.exe

Uses the VBS compiler for execution 1 TTPs

Command and Scripting Interpreter
T1059

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-4050598569-1597076380-177084960-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MicroUpdate = "C:\\Users\\Admin\\Documents\\MSDCSC\\msdcsc.exe"	vbc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 1072 set thread context of 3176	1072	cryptedserver.exe	83

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

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 4 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cryptedserver.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	vbc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	msdcsc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	b59f41b2e13be96995081ede3b5448ea_JaffaCakes118.exe

Suspicious use of AdjustPrivilegeToken 24 IoCs

description	pid	Process
Token: SeIncreaseQuotaPrivilege	3176	vbc.exe
Token: SeSecurityPrivilege	3176	vbc.exe
Token: SeTakeOwnershipPrivilege	3176	vbc.exe
Token: SeLoadDriverPrivilege	3176	vbc.exe
Token: SeSystemProfilePrivilege	3176	vbc.exe
Token: SeSystemtimePrivilege	3176	vbc.exe
Token: SeProfSingleProcessPrivilege	3176	vbc.exe
Token: SeIncBasePriorityPrivilege	3176	vbc.exe
Token: SeCreatePagefilePrivilege	3176	vbc.exe
Token: SeBackupPrivilege	3176	vbc.exe
Token: SeRestorePrivilege	3176	vbc.exe
Token: SeShutdownPrivilege	3176	vbc.exe
Token: SeDebugPrivilege	3176	vbc.exe
Token: SeSystemEnvironmentPrivilege	3176	vbc.exe
Token: SeChangeNotifyPrivilege	3176	vbc.exe
Token: SeRemoteShutdownPrivilege	3176	vbc.exe
Token: SeUndockPrivilege	3176	vbc.exe
Token: SeManageVolumePrivilege	3176	vbc.exe
Token: SeImpersonatePrivilege	3176	vbc.exe
Token: SeCreateGlobalPrivilege	3176	vbc.exe
Token: 33	3176	vbc.exe
Token: 34	3176	vbc.exe
Token: 35	3176	vbc.exe
Token: 36	3176	vbc.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 4476 wrote to memory of 1072	4476	b59f41b2e13be96995081ede3b5448ea_JaffaCakes118.exe	82
PID 4476 wrote to memory of 1072	4476	b59f41b2e13be96995081ede3b5448ea_JaffaCakes118.exe	82
PID 4476 wrote to memory of 1072	4476	b59f41b2e13be96995081ede3b5448ea_JaffaCakes118.exe	82
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 1072 wrote to memory of 3176	1072	cryptedserver.exe	83
PID 3176 wrote to memory of 3200	3176	vbc.exe	88
PID 3176 wrote to memory of 3200	3176	vbc.exe	88
PID 3176 wrote to memory of 3200	3176	vbc.exe	88

C:\Users\Admin\AppData\Local\Temp\b59f41b2e13be96995081ede3b5448ea_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\b59f41b2e13be96995081ede3b5448ea_JaffaCakes118.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4476
- C:\Users\Admin\AppData\Local\Temp\cryptedserver.exe
  "C:\Users\Admin\AppData\Local\Temp\cryptedserver.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1072
- - C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    C:\Windows\Microsoft.NET\Framework\v2.0.50727\vbc.exe
    3⤵
    - Modifies WinLogon for persistence
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:3176
  - - C:\Users\Admin\Documents\MSDCSC\msdcsc.exe
      "C:\Users\Admin\Documents\MSDCSC\msdcsc.exe"
      4⤵
      Executes dropped EXE
      System Location Discovery: System Language Discovery
      PID:3200

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

Persistence

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Privilege Escalation

Boot or Logon Autostart Execution

2

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Winlogon Helper DLL

1

T1547.004

Defense Evasion

Modify Registry

2

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\cryptedserver.exe

Filesize
512KB

MD5
b107f10aa6630f171041d1656e149099

SHA1
04fd8a3dddf3d158cfac0f2188ff515a4a1b7a9e

SHA256
723b12e22d8175f36f2e7b193823e1696eb228c56cffc87904726de4247457c7

SHA512
0c0812515112a6bf0d8708f78d375016ca9ae86dbe38aa4f6437f67021d7b25015c141d5d9a3ddcf86d012277c8fc64ac4ac934ad2dec66ddc9e627af48895e3

Download Submit
C:\Users\Admin\Documents\MSDCSC\msdcsc.exe

Filesize
1.1MB

MD5
d881de17aa8f2e2c08cbb7b265f928f9

SHA1
08936aebc87decf0af6e8eada191062b5e65ac2a

SHA256
b3a37093609f9a20ad60b85a9fa9de2ba674cba9b5bd687729440c70ba619ca0

SHA512
5f23bfb1b8740247b36ed0ab741738c7d4c949736129e767213e321607d1ccd3e3a8428e4ba44bd28a275b5e3f6206285b1a522514b7ef7ea5e698d90a713d34

Download Submit
memory/1072-11-0x0000000074AA2000-0x0000000074AA3000-memory.dmp

Filesize
4KB

Download
memory/1072-12-0x0000000074AA0000-0x0000000075051000-memory.dmp

Filesize
5.7MB

Download
memory/1072-13-0x0000000074AA0000-0x0000000075051000-memory.dmp

Filesize
5.7MB

Download
memory/1072-20-0x0000000074AA0000-0x0000000075051000-memory.dmp

Filesize
5.7MB

Download
memory/3176-14-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3176-15-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3176-17-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3176-18-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3176-19-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download
memory/3176-33-0x0000000000400000-0x00000000004B2000-memory.dmp

Filesize
712KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads