darkcomet | 21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b

General

Target

21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe
Size

3.8MB
MD5

34cd5816e7ef1cd87d916d4a282df5b1
SHA1

9301f7dd595356e74aca949900ca1ec60455e512
SHA256

21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b
SHA512

dad6a563b8b80233b38ec96c135b0f48ed7a6169dee8522f947afc08177cc440a73c8d1a0443e030595e4a911bd03176fc8dcfd64b396e91d2711f94441cbd36
SSDEEP

98304:vJwakG4fYrq1HJvpliCQHawbzBbGSlaUEI96kdQDanpqHrO3ndI3/lL/v7zVwwXp:vJwakG4fYrq1HJvpliCQHawbzBbGSla3

Score

10^/10

darkcomet discovery persistence rat trojan upx

Malware Config

Signatures

Darkcomet
DarkComet is a remote access trojan (RAT) developed by Jean-Pierre Lesueur.
trojan rat darkcomet
Darkcomet family
darkcomet
Checks BIOS information in registry 2 TTPs 1 IoCs
BIOS information is often read in order to detect sandboxing environments.

Query Registry
T1012

System Information Discovery
T1082

Processes:

mcsft.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate mcsft.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\SystemBiosDate	mcsft.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

Processes:

21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe

description	ioc	process
Key value queried	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\Control Panel\International\Geo\Nation	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe

Executes dropped EXE 2 IoCs

Processes:

mcsft.exemcsft.exe

pid process

3248 mcsft.exe
2860 mcsft.exe

pid	process
3248	mcsft.exe
2860	mcsft.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

reg.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-2878641211-696417878-3864914810-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\Mcrosoft = "C:\\Users\\Admin\\AppData\\Roaming\\mcsft.exe"	reg.exe

Suspicious use of SetThreadContext 1 IoCs

Processes:

mcsft.exe

description pid process target process

PID 3248 set thread context of 2860 3248 mcsft.exe mcsft.exe

description	pid	process	target process
PID 3248 set thread context of 2860	3248	mcsft.exe	mcsft.exe

UPX packed file 21 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

Processes:

resource	yara_rule
behavioral2/memory/628-0-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
C:\Users\Admin\AppData\Roaming\mcsft.txt	upx
behavioral2/memory/628-30-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/2860-31-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-34-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-35-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/3248-36-0x0000000000400000-0x00000000007C9000-memory.dmp	upx
behavioral2/memory/2860-37-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-38-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-40-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-43-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-42-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-41-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-39-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-44-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-47-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-49-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-51-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-53-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-55-0x0000000000400000-0x00000000004B5000-memory.dmp	upx
behavioral2/memory/2860-58-0x0000000000400000-0x00000000004B5000-memory.dmp	upx

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 5 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

Processes:

mcsft.exemcsft.exe21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.execmd.exereg.exe

description	ioc	process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mcsft.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	mcsft.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	reg.exe

Checks processor information in registry 2 TTPs 4 IoCs

Processor information is often read in order to detect sandboxing environments.

Query Registry

T1012

System Information Discovery

T1082

Processes:

mcsft.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\VendorIdentifier	mcsft.exe
Key opened	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0	mcsft.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\ProcessorNameString	mcsft.exe
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\CentralProcessor\0\Identifier	mcsft.exe

Enumerates system info in registry 2 TTPs 1 IoCs

Query Registry
T1012

System Information Discovery
T1082

Processes:

mcsft.exe

description ioc process

Key value queried \REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier mcsft.exe

description	ioc	process
Key value queried	\REGISTRY\MACHINE\HARDWARE\DESCRIPTION\System\Identifier	mcsft.exe

Suspicious use of AdjustPrivilegeToken 24 IoCs

Processes:

mcsft.exe

description	pid	process
Token: SeIncreaseQuotaPrivilege	2860	mcsft.exe
Token: SeSecurityPrivilege	2860	mcsft.exe
Token: SeTakeOwnershipPrivilege	2860	mcsft.exe
Token: SeLoadDriverPrivilege	2860	mcsft.exe
Token: SeSystemProfilePrivilege	2860	mcsft.exe
Token: SeSystemtimePrivilege	2860	mcsft.exe
Token: SeProfSingleProcessPrivilege	2860	mcsft.exe
Token: SeIncBasePriorityPrivilege	2860	mcsft.exe
Token: SeCreatePagefilePrivilege	2860	mcsft.exe
Token: SeBackupPrivilege	2860	mcsft.exe
Token: SeRestorePrivilege	2860	mcsft.exe
Token: SeShutdownPrivilege	2860	mcsft.exe
Token: SeDebugPrivilege	2860	mcsft.exe
Token: SeSystemEnvironmentPrivilege	2860	mcsft.exe
Token: SeChangeNotifyPrivilege	2860	mcsft.exe
Token: SeRemoteShutdownPrivilege	2860	mcsft.exe
Token: SeUndockPrivilege	2860	mcsft.exe
Token: SeManageVolumePrivilege	2860	mcsft.exe
Token: SeImpersonatePrivilege	2860	mcsft.exe
Token: SeCreateGlobalPrivilege	2860	mcsft.exe
Token: 33	2860	mcsft.exe
Token: 34	2860	mcsft.exe
Token: 35	2860	mcsft.exe
Token: 36	2860	mcsft.exe

Suspicious use of SetWindowsHookEx 3 IoCs

Processes:

21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exemcsft.exemcsft.exe

pid process

628 21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe
3248 mcsft.exe
2860 mcsft.exe

pid	process
628	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe
3248	mcsft.exe
2860	mcsft.exe

Suspicious use of WriteProcessMemory 17 IoCs

Processes:

21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.execmd.exemcsft.exe

description	pid	process	target process
PID 628 wrote to memory of 1084	628	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	cmd.exe
PID 628 wrote to memory of 1084	628	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	cmd.exe
PID 628 wrote to memory of 1084	628	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	cmd.exe
PID 1084 wrote to memory of 1896	1084	cmd.exe	reg.exe
PID 1084 wrote to memory of 1896	1084	cmd.exe	reg.exe
PID 1084 wrote to memory of 1896	1084	cmd.exe	reg.exe
PID 628 wrote to memory of 3248	628	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	mcsft.exe
PID 628 wrote to memory of 3248	628	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	mcsft.exe
PID 628 wrote to memory of 3248	628	21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe	mcsft.exe
PID 3248 wrote to memory of 2860	3248	mcsft.exe	mcsft.exe
PID 3248 wrote to memory of 2860	3248	mcsft.exe	mcsft.exe
PID 3248 wrote to memory of 2860	3248	mcsft.exe	mcsft.exe
PID 3248 wrote to memory of 2860	3248	mcsft.exe	mcsft.exe
PID 3248 wrote to memory of 2860	3248	mcsft.exe	mcsft.exe
PID 3248 wrote to memory of 2860	3248	mcsft.exe	mcsft.exe
PID 3248 wrote to memory of 2860	3248	mcsft.exe	mcsft.exe
PID 3248 wrote to memory of 2860	3248	mcsft.exe	mcsft.exe

C:\Users\Admin\AppData\Local\Temp\21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe
"C:\Users\Admin\AppData\Local\Temp\21fc136d129a38f2e77543eac002391c9b430405af5580ba9e067f484c66b36b.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:628
- C:\Windows\SysWOW64\cmd.exe
  C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\ZToNe.bat" "
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:1084
- - C:\Windows\SysWOW64\reg.exe
    REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Run" /v "Mcrosoft" /t REG_SZ /d "C:\Users\Admin\AppData\Roaming\mcsft.exe" /f
    3⤵
    - Adds Run key to start application
    - System Location Discovery: System Language Discovery
    PID:1896
- C:\Users\Admin\AppData\Roaming\mcsft.exe
  "C:\Users\Admin\AppData\Roaming\mcsft.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of SetThreadContext
  - System Location Discovery: System Language Discovery
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3248
- - C:\Users\Admin\AppData\Roaming\mcsft.exe
    C:\Users\Admin\AppData\Roaming\mcsft.exe
    3⤵
    - Checks BIOS information in registry
    - Executes dropped EXE
    - System Location Discovery: System Language Discovery
    - Checks processor information in registry
    - Enumerates system info in registry
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    PID:2860

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

4

T1012

System Information Discovery

5

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\ZToNe.txt

Filesize
135B

MD5
a5feca573884d76f559b996d45e8ad9a

SHA1
0e81a993f3af4e31d60653dc2513186f0495f1c8

SHA256
c98e20d46d6465febb5d29cfab51241521ea5d6cd621f5e18b9b7d6fbfac3f0f

SHA512
a9239648b5f15eac4d4151b6e1bdc81065eeaeb101404c2a0126f03bc87f1e6a57206bfa07a44379e9d3bba889e4497a9991ff41fb109099b01512df3dc3cbda

Download Submit
C:\Users\Admin\AppData\Roaming\mcsft.txt

Filesize
3.8MB

MD5
de36b2332e2ac91d993ea0f298abf2db

SHA1
e7df6f388d3f8a2e3bae7b0236cb1a7ef2104a2b

SHA256
adcd7faae1eb92dcbd693b7214b0f635934fb8452a0f57b000a1e68281d4204c

SHA512
9d17df2a2ac83feebb75ddd17141562fcfc46e7d78b44ea05bb0a91f2425aea14209848dccb31b7064be7e5ed72c40fb1b91f5303fc915747e5c68b59e8aea09

Download Submit
memory/628-0-0x0000000000400000-0x00000000007C9000-memory.dmp

Filesize
3.8MB

Download
memory/628-30-0x0000000000400000-0x00000000007C9000-memory.dmp

Filesize
3.8MB

Download
memory/2860-40-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-41-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-35-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-58-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-37-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-38-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-31-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-43-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-42-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-34-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-39-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-44-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-47-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-49-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-51-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-53-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/2860-55-0x0000000000400000-0x00000000004B5000-memory.dmp

Filesize
724KB

Download
memory/3248-36-0x0000000000400000-0x00000000007C9000-memory.dmp

Filesize
3.8MB

Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads