remcos | 05fe60e021bffcac2ae463fc54c9df400b6d231c1721515909af05d226d52a75

General

Target
nxs64.exe
Size 633KB
Sample260827-w2awsaaf96
SHA256 05fe60e021bffcac2ae463fc54c9df400b6d231c1721515909af05d226d52a75
MD5 50103b7e2d05319d8d6c5fc5e998acab
SHA1 eb7a3fe85a9de2e3ed4f1b9f7aa684221cbb99ef
SHA512 d3b8986df636720e3a6c636ca85287ac1bead209aa60460edc5c25b8efc21bb89101ab2be4ef6922c768ef4d0f3932727b6c52858c7963788e352e4a4382e245
SSDEEP 12288:5SGuIuF0MV/VSU5s11yuTUHaaPC+6P/to0Z5hdr:cGuNF0MV/VSU5+1yhHaaPX6P/trZ5
TLSH
T108D45C55A3D442F8D07BC135C9828527E7F2BC056671872F03D74E5B6F232A1AF2AB26
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

collection discovery remcos rat suricata

Malware Config

Signatures

Family: Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos

Suricata alert: REMCOS RAT Malware Inbound C2 Communication 7 IoCs

Network activity triggered a Suricata alert

suricata remcos

flow	pid	Process
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe

Suricata alert: REMCOS RAT Malware Outbound C2 Communication 13 IoCs

Network activity triggered a Suricata alert

suricata remcos

flow	pid	Process
2	1236	nxs64.exe
2	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
8	1236	nxs64.exe
10	1236	nxs64.exe
10	1236	nxs64.exe

Detected Nirsoft tools 1 IoCs

Free utilities often used by attackers which can steal passwords, product keys, etc.

resource	yara_rule
behavioral2/memory/1720-4-0x0000000000400000-0x0000000000424000-memory.dmp	Nirsoft

Accesses Microsoft Outlook accounts 1 TTPs 1 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	userinit.exe

Accesses Microsoft Outlook profiles 1 TTPs 3 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key queried	\REGISTRY\USER\S-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	userinit.exe
Key opened	\REGISTRY\USER\S-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	userinit.exe
Key enumerated	\REGISTRY\USER\S-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	userinit.exe

Suspicious use of SetThreadContext 3 IoCs

description	pid	Process	procid_target
PID 1236 set thread context of 3392	1236	nxs64.exe	88
PID 1236 set thread context of 2244	1236	nxs64.exe	89
PID 1236 set thread context of 1720	1236	nxs64.exe	90

System Location Discovery: System Language Discovery 1 TTPs 3 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	userinit.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	userinit.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	userinit.exe

Suspicious behavior: EnumeratesProcesses 12 IoCs

pid	Process
3392	userinit.exe
3392	userinit.exe
1720	userinit.exe
1720	userinit.exe
3392	userinit.exe
3392	userinit.exe
3392	userinit.exe
3392	userinit.exe
3392	userinit.exe
3392	userinit.exe
3392	userinit.exe
3392	userinit.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	1720	userinit.exe
Token: SeImpersonatePrivilege	3392	userinit.exe
Token: SeImpersonatePrivilege	3392	userinit.exe
Token: SeImpersonatePrivilege	3392	userinit.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1236	nxs64.exe

Suspicious use of WriteProcessMemory 3 IoCs

description	pid	Process	procid_target
PID 1236 wrote to memory of 3392	1236	nxs64.exe	88
PID 1236 wrote to memory of 2244	1236	nxs64.exe	89
PID 1236 wrote to memory of 1720	1236	nxs64.exe	90

outlook_office_path 1 IoCs

description	ioc	Process
Key queried	\REGISTRY\USER\S-1-5-21-2301830172-776172150-2531349243-1000\Software\Microsoft\Office\16.0\Outlook\Profiles\Outlook	userinit.exe

C:\Users\Admin\AppData\Local\Temp\nxs64.exe
"C:\Users\Admin\AppData\Local\Temp\nxs64.exe"
1⤵
- Suricata alert: REMCOS RAT Malware Inbound C2 Communication
- Suricata alert: REMCOS RAT Malware Outbound C2 Communication
- Suspicious use of SetThreadContext
- Suspicious use of SetWindowsHookEx
- Suspicious use of WriteProcessMemory
PID:1236
- C:\Windows\SysWOW64\userinit.exe
  /stext "C:\Users\Admin\AppData\Local\Temp\tqqmwtmofcsstqhx"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:3392
- C:\Windows\SysWOW64\userinit.exe
  /stext "C:\Users\Admin\AppData\Local\Temp\dtwwxlwitkkxvxdbibi"
  2⤵
  - Accesses Microsoft Outlook accounts
  - Accesses Microsoft Outlook profiles
  - System Location Discovery: System Language Discovery
  - outlook_office_path
  PID:2244
- C:\Windows\SysWOW64\userinit.exe
  /stext "C:\Users\Admin\AppData\Local\Temp\onjpydhjhsckflrfzmdashi"
  2⤵
  - System Location Discovery: System Language Discovery
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1720

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

Lateral Movement

Collection

Email Collection

2

T1114

Command and Control

Exfiltration

Impact

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tqqmwtmofcsstqhx

Path C:\Users\Admin\AppData\Local\Temp\tqqmwtmofcsstqhx
Size 2B
SHA256 b3d510ef04275ca8e698e5b3cbb0ece3949ef9252f0cdc839e9ee347409a2209
MD5 f3b25701fe362ec84616a93a45ce9998
SHA1 d62636d8caec13f04e28442a0a6fa1afeb024bbb
SHA512 98c5f56f3de340690c139e58eb7dac111979f0d4dffe9c4b24ff849510f4b6ffa9fd608c0a3de9ac3c9fd2190f0efaf715309061490f9755a9bfdf1c54ca0d84
MD5 SHA1 SHA512

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memory/1236-11-0x0000000180000000-0x000000018001D000-memory.dmp

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memory/1236-15-0x0000000180000000-0x000000018001D000-memory.dmp

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memory/1236-14-0x0000000180000000-0x000000018001D000-memory.dmp

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memory/1720-2-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/1720-4-0x0000000000400000-0x0000000000424000-memory.dmp

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memory/2244-1-0x0000000000400000-0x000000000045E000-memory.dmp

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memory/2244-7-0x0000000000400000-0x000000000045E000-memory.dmp

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memory/3392-0-0x0000000000400000-0x000000000047E000-memory.dmp

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memory/3392-9-0x0000000000400000-0x000000000047E000-memory.dmp

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Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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