njrat | aa8b18a4f3db53e54589e2ada92a147219ed8a8a2cf92ebc50f8a670eed226ef

General

Target

MasonClient.exe
Size

43KB
MD5

057f6e706df8a5c267fd6695ab1502f2
SHA1

8ff73f496305d8c9d20c59a6de47df3b6934eb6f
SHA256

aa8b18a4f3db53e54589e2ada92a147219ed8a8a2cf92ebc50f8a670eed226ef
SHA512

f8124aa2784184bae9e49116f4f9c11922ae75e04f53a4ea2db38664d0b316052977e39ebfc473ce1649feada201e415b707aa1e9f7dbbff2d233669a7bb63be
SSDEEP

768:pRg+rDjLP5U1b9foYPRhlzd6aO9Zh5AuffEx:pRvHPUb9wYPlB6aOTPkx

Score

10^/10

njrat xworm byabolhb execution persistence rat trojan

Malware Config

Extracted

Family

njrat

Version

QUJPTEhC

Botnet

ByABOLHB

C2

abolhb.com:505

Mutex

66f73d9b4e94d115b763eaa1ada7d1f1

Attributes

reg_key
66f73d9b4e94d115b763eaa1ada7d1f1
splitter
|'|'|

Extracted

Family

xworm

C2

review-monroe.gl.at.ply.gg:46169

Mutex

lWfA9hbGdE2IDzRq

Attributes

Install_directory
%AppData%
install_file
Mason.exe

aes.plain

Signatures

Detect Xworm Payload 1 IoCs

resource	yara_rule
behavioral2/memory/4600-48-0x000000001CD10000-0x000000001CD1E000-memory.dmp	family_xworm

Njrat family
njrat
Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm
njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat

Command and Scripting Interpreter: PowerShell 1 TTPs 3 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
1432	powershell.exe
3380	powershell.exe
1416	powershell.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-1-5-21-493223053-2004649691-1575712786-1000\Control Panel\International\Geo\Nation	MasonClient.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\MasonClient.lnk	MasonClient.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\MasonClient.lnk	MasonClient.exe

Executes dropped EXE 2 IoCs

pid	Process
1692	MasonClient.exe
224	MasonClient.exe

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-1-5-21-493223053-2004649691-1575712786-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\MasonClient = "C:\\ProgramData\\MasonClient.exe"	MasonClient.exe

Legitimate hosting services abused for malware hosting/C2 1 TTPs 3 IoCs

Web Service

T1102

flow	ioc
17	raw.githubusercontent.com
18	raw.githubusercontent.com
19	raw.githubusercontent.com

Looks up external IP address via web service 1 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
4	ip-api.com

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

System Information Discovery
T1082

Scheduled Task/Job: Scheduled Task 1 TTPs 1 IoCs

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

persistence execution

Scheduled Task

T1053.005

pid	Process
4032	schtasks.exe

Suspicious behavior: EnumeratesProcesses 6 IoCs

pid	Process
1432	powershell.exe
1432	powershell.exe
3380	powershell.exe
3380	powershell.exe
1416	powershell.exe
1416	powershell.exe

Suspicious use of AdjustPrivilegeToken 7 IoCs

description	pid	Process
Token: SeDebugPrivilege	4600	MasonClient.exe
Token: SeDebugPrivilege	1432	powershell.exe
Token: SeDebugPrivilege	3380	powershell.exe
Token: SeDebugPrivilege	1416	powershell.exe
Token: SeDebugPrivilege	4600	MasonClient.exe
Token: SeDebugPrivilege	1692	MasonClient.exe
Token: SeDebugPrivilege	224	MasonClient.exe

Suspicious use of WriteProcessMemory 8 IoCs

description	pid	Process	procid_target
PID 4600 wrote to memory of 1432	4600	MasonClient.exe	84
PID 4600 wrote to memory of 1432	4600	MasonClient.exe	84
PID 4600 wrote to memory of 3380	4600	MasonClient.exe	86
PID 4600 wrote to memory of 3380	4600	MasonClient.exe	86
PID 4600 wrote to memory of 1416	4600	MasonClient.exe	88
PID 4600 wrote to memory of 1416	4600	MasonClient.exe	88
PID 4600 wrote to memory of 4032	4600	MasonClient.exe	91
PID 4600 wrote to memory of 4032	4600	MasonClient.exe	91

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\MasonClient.exe
"C:\Users\Admin\AppData\Local\Temp\MasonClient.exe"
1⤵
- Checks computer location settings
- Drops startup file
- Adds Run key to start application
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:4600
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Local\Temp\MasonClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1432
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'MasonClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3380
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\ProgramData\MasonClient.exe'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1416
- C:\Windows\System32\schtasks.exe
  "C:\Windows\System32\schtasks.exe" /create /f /RL HIGHEST /sc minute /mo 1 /tn "MasonClient" /tr "C:\Users\Admin\AppData\Roaming\MasonClient.exe"
  2⤵
  - Scheduled Task/Job: Scheduled Task
  PID:4032

C:\Users\Admin\AppData\Roaming\MasonClient.exe
C:\Users\Admin\AppData\Roaming\MasonClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:1692

C:\Users\Admin\AppData\Roaming\MasonClient.exe
C:\Users\Admin\AppData\Roaming\MasonClient.exe
1⤵
- Executes dropped EXE
- Suspicious use of AdjustPrivilegeToken
PID:224

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Scheduled Task/Job

1

T1053

Scheduled Task

1

T1053.005

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

2

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Web Service

1

T1102

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\MasonClient.exe.log

Filesize
654B

MD5
2ff39f6c7249774be85fd60a8f9a245e

SHA1
684ff36b31aedc1e587c8496c02722c6698c1c4e

SHA256
e1b91642d85d98124a6a31f710e137ab7fd90dec30e74a05ab7fcf3b7887dced

SHA512
1d7e8b92ef4afd463d62cfa7e8b9d1799db5bf2a263d3cd7840df2e0a1323d24eb595b5f8eb615c6cb15f9e3a7b4fc99f8dd6a3d34479222e966ec708998aed1

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
6d3e9c29fe44e90aae6ed30ccf799ca8

SHA1
c7974ef72264bbdf13a2793ccf1aed11bc565dce

SHA256
2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d

SHA512
60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
ef72c47dbfaae0b9b0d09f22ad4afe20

SHA1
5357f66ba69b89440b99d4273b74221670129338

SHA256
692ec20c7039170fb199510f0436181fd155e6b4516d4d1c9e1675adf99aaa7f

SHA512
7514b6bc8dc39fa618223300be27cd535dc35b18c66b4a089e2302e72b3e0cac06d88a989fa1296feb386b3cbe2084019df6430c7f895071b76e04ce559a30b4

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_lbpobksg.vd4.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\MasonClient.exe

Filesize
43KB

MD5
057f6e706df8a5c267fd6695ab1502f2

SHA1
8ff73f496305d8c9d20c59a6de47df3b6934eb6f

SHA256
aa8b18a4f3db53e54589e2ada92a147219ed8a8a2cf92ebc50f8a670eed226ef

SHA512
f8124aa2784184bae9e49116f4f9c11922ae75e04f53a4ea2db38664d0b316052977e39ebfc473ce1649feada201e415b707aa1e9f7dbbff2d233669a7bb63be

Download Submit
memory/1432-13-0x000002A2C93F0000-0x000002A2C9412000-memory.dmp

Filesize
136KB

Download
memory/1432-17-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/1432-14-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/1432-3-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/4600-0-0x00007FFA81103000-0x00007FFA81105000-memory.dmp

Filesize
8KB

Download
memory/4600-47-0x000000001C340000-0x000000001C34C000-memory.dmp

Filesize
48KB

Download
memory/4600-48-0x000000001CD10000-0x000000001CD1E000-memory.dmp

Filesize
56KB

Download
memory/4600-49-0x00007FFA81103000-0x00007FFA81105000-memory.dmp

Filesize
8KB

Download
memory/4600-2-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/4600-51-0x00007FFA81100000-0x00007FFA81BC1000-memory.dmp

Filesize
10.8MB

Download
memory/4600-1-0x0000000000A90000-0x0000000000AA2000-memory.dmp

Filesize
72KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads