tofsee | a5462ebc51b4e3cee8e57ff06c11fae6a86029c95a8975fc5d4b8efc8f1f39dd

Analysis

max time kernel
149s
max time network
150s
platform
windows10-2004_x64
resource
win10v2004-20240802-en
resource tags

arch:x64arch:x86image:win10v2004-20240802-enlocale:en-usos:windows10-2004-x64system
submitted
06/09/2024, 18:28

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General

Target
c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe
Size 213KB
Sample240906-w4ebzssale
SHA256 c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5
MD5 8e456f932787fcd0cadbb598174575b2
SHA1 22b069c76b86bdb6be8cdafc78019b55c583062e
SHA512 cb26a33dacdcfe804bdd587ecd44b9bf1c59f357e8701fc4f5e1b04d8d8882466c7743fac51969fe8912e1197a5653986eb4a71edc35eee89051b6c98d546c9d
SSDEEP 6144:MGDLD6Tj3Vyg0mwiRjaVlodEFjvn/Mq0Vdh1HQ:M+L2n3VygtzRWJjv+Vdz
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

tofsee discovery evasion execution persistence privilege_escalation trojan

Malware Config

Extracted

Family

tofsee

vanaheim.cn
jotunheim.name

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee
Creates new service(s) 2 TTPs
persistence execution

Windows Service
T1543.003

Service Execution
T1569.002

Modifies Windows Firewall 2 TTPs 1 IoCs

evasion

Windows Service

T1543.003

Disable or Modify System Firewall

T1562.004

pid	Process
2764	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Services\bmqqkrc\ImagePath = "C:\\Windows\\SysWOW64\\bmqqkrc\\aqqnzlbz.exe"	svchost.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-1-5-21-656926755-4116854191-210765258-1000\Control Panel\International\Geo\Nation	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe

Executes dropped EXE 1 IoCs

pid	Process
4632	aqqnzlbz.exe

Drops file in System32 directory 1 IoCs

description	ioc	Process
File created	C:\Windows\SysWOW64\config\systemprofile:.repos	svchost.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4632 set thread context of 1592	4632	aqqnzlbz.exe	100

Launches sc.exe 3 IoCs

Sc.exe is a Windows utlilty to control services on the system.

pid	Process
4720	sc.exe
1888	sc.exe
2324	sc.exe

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

System Information Discovery
T1082

Event Triggered Execution: Netsh Helper DLL 1 TTPs 3 IoCs

Netsh.exe (also referred to as Netshell) is a command-line scripting utility used to interact with the network configuration of a system.

persistence privilege_escalation

Netsh Helper DLL

T1546.007

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key queried	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe
Key value enumerated	\REGISTRY\MACHINE\SOFTWARE\WOW6432Node\Microsoft\NetSh	netsh.exe

System Location Discovery: System Language Discovery 1 TTPs 9 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	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	sc.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	netsh.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	aqqnzlbz.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	svchost.exe

Modifies data under HKEY_USERS 2 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\.DEFAULT\Control Panel\Buses	svchost.exe
Set value (data)	\REGISTRY\USER\.DEFAULT\Control Panel\Buses\Config0 = 008da73d86e7c10224edb47d450dd49d084297dce82e72baa4c0ed8a0a66a31d4635bceb80cd945d24edb47d470dd49d024195daf71261adc06d04fda6e22673bbc9154961cda5681dd4804c7234e5ab644490bdb57e25e59d5c06cefcb954758df21d5904e0ad6516d88349773aec9d084295d9e13f4bb4c06d00fdadfd5429dc94460531faa464249ec60b1b79bdf0012dd98fb47f21ea9d5c07c8f58d387287cc186270a4f93824dc81447d39e5ab5d1bc6bd	svchost.exe

Suspicious use of WriteProcessMemory 23 IoCs

description	pid	Process	procid_target
PID 4700 wrote to memory of 4492	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	87
PID 4700 wrote to memory of 4492	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	87
PID 4700 wrote to memory of 4492	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	87
PID 4700 wrote to memory of 1724	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	89
PID 4700 wrote to memory of 1724	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	89
PID 4700 wrote to memory of 1724	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	89
PID 4700 wrote to memory of 4720	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	91
PID 4700 wrote to memory of 4720	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	91
PID 4700 wrote to memory of 4720	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	91
PID 4700 wrote to memory of 1888	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	93
PID 4700 wrote to memory of 1888	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	93
PID 4700 wrote to memory of 1888	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	93
PID 4700 wrote to memory of 2324	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	95
PID 4700 wrote to memory of 2324	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	95
PID 4700 wrote to memory of 2324	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	95
PID 4700 wrote to memory of 2764	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	98
PID 4700 wrote to memory of 2764	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	98
PID 4700 wrote to memory of 2764	4700	c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe	98
PID 4632 wrote to memory of 1592	4632	aqqnzlbz.exe	100
PID 4632 wrote to memory of 1592	4632	aqqnzlbz.exe	100
PID 4632 wrote to memory of 1592	4632	aqqnzlbz.exe	100
PID 4632 wrote to memory of 1592	4632	aqqnzlbz.exe	100
PID 4632 wrote to memory of 1592	4632	aqqnzlbz.exe	100

C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe
"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
1⤵
- Checks computer location settings
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4700
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bmqqkrc\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:4492
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\aqqnzlbz.exe" C:\Windows\SysWOW64\bmqqkrc\
  2⤵
  - System Location Discovery: System Language Discovery
  PID:1724
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create bmqqkrc binPath= "C:\Windows\SysWOW64\bmqqkrc\aqqnzlbz.exe /d\"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:4720
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description bmqqkrc "wifi internet conection"
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:1888
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start bmqqkrc
  2⤵
  - Launches sc.exe
  - System Location Discovery: System Language Discovery
  PID:2324
- C:\Windows\SysWOW64\netsh.exe
  "C:\Windows\System32\netsh.exe" advfirewall firewall add rule name="Host-process for services of Windows" dir=in action=allow program="C:\Windows\SysWOW64\svchost.exe" enable=yes>nul
  2⤵
  - Modifies Windows Firewall
  - Event Triggered Execution: Netsh Helper DLL
  - System Location Discovery: System Language Discovery
  PID:2764

C:\Windows\SysWOW64\bmqqkrc\aqqnzlbz.exe
C:\Windows\SysWOW64\bmqqkrc\aqqnzlbz.exe /d"C:\Users\Admin\AppData\Local\Temp\c55859f35ad07e3e4b13f45fa5fa4c788f7059daac930ea435600a936104c1b5.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:4632
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Drops file in System32 directory
  - System Location Discovery: System Language Discovery
  - Modifies data under HKEY_USERS
  PID:1592

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

System Services

T1569

Service Execution

T1569.002

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Privilege Escalation

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

Event Triggered Execution

T1546

Netsh Helper DLL

T1546.007

Defense Evasion

Impair Defenses

T1562

Disable or Modify System Firewall

T1562.004

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

System Location Discovery

T1614

System Language Discovery

T1614.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

aqqnzlbz.exe

Path C:\Users\Admin\AppData\Local\Temp\aqqnzlbz.exe
Size 14.6MB
SHA256 44e933425d7be460fac55d894694cda9c84fd324e0ff4a772b5f07c3f5da081c
MD5 6d6822b504add7c4b11ec815c7639e80
SHA1 9a7cf5b1a1e744897c6dd99278f37a94c9f225cc
SHA512 5079b34d7dc73c7a7af060a9d6fb5c78c452924badfae44e8be1a31be20e4a0543ff77532d86cf69144051be913a9f23ac48255309e488bb7ee6ddbb301b5166
SSDEEP 49152:dLaRlaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaX:d
MD5 SHA1 SHA512 SSDEEP

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memory/1592-10-0x0000000000D20000-0x0000000000D35000-memory.dmp

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memory/1592-16-0x0000000000D20000-0x0000000000D35000-memory.dmp

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memory/1592-17-0x0000000000D20000-0x0000000000D35000-memory.dmp

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memory/4632-9-0x0000000000400000-0x000000000043C000-memory.dmp

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memory/4632-15-0x0000000000400000-0x000000000043C000-memory.dmp

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memory/4700-3-0x0000000000400000-0x0000000000415000-memory.dmp

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memory/4700-2-0x00000000005E0000-0x00000000005F3000-memory.dmp

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memory/4700-8-0x00000000006B0000-0x00000000007B0000-memory.dmp

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memory/4700-1-0x00000000006B0000-0x00000000007B0000-memory.dmp

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memory/4700-12-0x00000000005E0000-0x00000000005F3000-memory.dmp

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memory/4700-13-0x0000000000400000-0x000000000043C000-memory.dmp

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memory/4700-14-0x0000000000400000-0x0000000000415000-memory.dmp

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Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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