njrat | 577b92a3a23917f55b1156d87ae4d4824894a3b15ae687ffa8b8af125a10438c

General

Target

Cirular-18April2017/Circular.Doc.lnk
Size

1KB
MD5

f0093f6cb0dec239c81d9946380ea172
SHA1

56a49a4d52b6f7fc94623c769df2aaf1b46f4c42
SHA256

7818dd357bd780aae737e94f8f57b5b2cb643ceca8cc044c866d31d953ed3621
SHA512

1af3a27846ee084941e4511500a6bfea5f51f97d9868e4f87711dc717a4651bde664d9ef234c2602b4def28522694a52ddc9ed6c259985a41936dac79e0f1ba2

Score

10^/10

njrat zalupa180417 evasion trojan

Malware Config

Extracted

Family

njrat

Version

0.7d

Botnet

zalupa180417

C2

808080.ddns.net:5555

Mutex

4cb72bb7475074f5af41f3e5e189ee3f

Attributes

reg_key
4cb72bb7475074f5af41f3e5e189ee3f
splitter
|'|'|

Signatures

njRAT/Bladabindi
Widely used RAT written in .NET.
trojan njrat
Modifies Windows Firewall 1 TTPs
evasion

Modify Existing Service
T1031

Drops startup file 2 IoCs

Processes:

Circular.Doc

description	ioc	process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\FlashUpdate.exe	Circular.Doc
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\FlashUpdate.exe	Circular.Doc

Suspicious use of SetThreadContext 1 IoCs

Processes:

Circular.Doc

description pid process target process

PID 688 set thread context of 1484 688 Circular.Doc RegAsm.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: CmdExeWriteProcessMemorySpam 1 IoCs

Processes:

Circular.Doc

pid process

688 Circular.Doc
Suspicious behavior: EnumeratesProcesses 2 IoCs

Processes:

Circular.Doc

pid process

688 Circular.Doc
688 Circular.Doc

description	pid	process	target process
PID 688 set thread context of 1484	688	Circular.Doc	RegAsm.exe

pid	process
688	Circular.Doc

pid	process
688	Circular.Doc
688	Circular.Doc

Suspicious use of AdjustPrivilegeToken 34 IoCs

Processes:

Circular.DocRegAsm.exe

description	pid	process
Token: SeDebugPrivilege	688	Circular.Doc
Token: SeDebugPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe
Token: 33	1484	RegAsm.exe
Token: SeIncBasePriorityPrivilege	1484	RegAsm.exe

Suspicious use of WriteProcessMemory 23 IoCs

Processes:

cmd.execmd.exeCircular.DocRegAsm.exe

description	pid	process	target process
PID 756 wrote to memory of 584	756	cmd.exe	cmd.exe
PID 756 wrote to memory of 584	756	cmd.exe	cmd.exe
PID 756 wrote to memory of 584	756	cmd.exe	cmd.exe
PID 584 wrote to memory of 688	584	cmd.exe	Circular.Doc
PID 584 wrote to memory of 688	584	cmd.exe	Circular.Doc
PID 584 wrote to memory of 688	584	cmd.exe	Circular.Doc
PID 584 wrote to memory of 688	584	cmd.exe	Circular.Doc
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 688 wrote to memory of 1484	688	Circular.Doc	RegAsm.exe
PID 1484 wrote to memory of 1996	1484	RegAsm.exe	netsh.exe
PID 1484 wrote to memory of 1996	1484	RegAsm.exe	netsh.exe
PID 1484 wrote to memory of 1996	1484	RegAsm.exe	netsh.exe
PID 1484 wrote to memory of 1996	1484	RegAsm.exe	netsh.exe

C:\Windows\system32\cmd.exe
cmd /c C:\Users\Admin\AppData\Local\Temp\Cirular-18April2017\Circular.Doc.lnk
1⤵
- Suspicious use of WriteProcessMemory
PID:756

C:\Windows\System32\cmd.exe
"C:\Windows\System32\cmd.exe" /c Circular.Doc
2⤵
- Suspicious use of WriteProcessMemory
PID:584

C:\Users\Admin\AppData\Local\Temp\Cirular-18April2017\Circular.Doc
Circular.Doc
3⤵
- Drops startup file
- Suspicious use of SetThreadContext
- Suspicious behavior: CmdExeWriteProcessMemorySpam
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:688

C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe
"C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe"
4⤵
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1484

C:\Windows\SysWOW64\netsh.exe
netsh firewall add allowedprogram "C:\Windows\Microsoft.NET\Framework\v2.0.50727\RegAsm.exe" "RegAsm.exe" ENABLE
5⤵
PID:1996

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Modify Existing Service

1

T1031

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

memory/688-55-0x0000000075431000-0x0000000075433000-memory.dmp

Filesize
8KB

Download
memory/688-56-0x0000000001F60000-0x0000000001F61000-memory.dmp

Filesize
4KB

Download
memory/688-57-0x0000000000830000-0x0000000000910000-memory.dmp

Filesize
896KB

Download
memory/688-62-0x0000000001E30000-0x0000000001E31000-memory.dmp

Filesize
4KB

Download
memory/756-54-0x000007FEFBE11000-0x000007FEFBE13000-memory.dmp

Filesize
8KB

Download
memory/1484-58-0x0000000000400000-0x000000000040C000-memory.dmp

Filesize
48KB

Download
memory/1484-61-0x0000000000400000-0x000000000040C000-memory.dmp

Filesize
48KB

Download
memory/1484-60-0x0000000000400000-0x000000000040C000-memory.dmp

Filesize
48KB

Download
memory/1484-63-0x0000000000400000-0x000000000040C000-memory.dmp

Filesize
48KB

Download
memory/1484-59-0x0000000000400000-0x000000000040C000-memory.dmp

Filesize
48KB

Download
memory/1484-65-0x0000000000820000-0x0000000000821000-memory.dmp

Filesize
4KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

Replay Monitor

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Downloads