tofsee | bb19283d50fe702280862d84abb9a72f6546de7d5f030bba4266fc589bb93bd3

Analysis

max time kernel
185s
max time network
160s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
10/01/2024, 10:01

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General

Target

504365551a406e82ac71872b066960e6.exe
Size

10.5MB
MD5

504365551a406e82ac71872b066960e6
SHA1

03af4ce319ee6b27aa816bb6a24a35ca606c140e
SHA256

bb19283d50fe702280862d84abb9a72f6546de7d5f030bba4266fc589bb93bd3
SHA512

0656f6cfcfc92e94a877dca8f7281576d1a247ce75f81e7ef1b14fe8b2f7edfc2f93a3ef6013f668f994b92dcc019fdc1759f10ef505c64f8e977dec7a56bd9b
SSDEEP

49152:2ckGb22222222222222222222222222222222222222222222222222222222223:2ck

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

43.231.4.7

lazystax.ru

Signatures

Tofsee
Backdoor/botnet which carries out malicious activities based on commands from a C2 server.
trojan tofsee

Windows security bypass 2 TTPs 1 IoCs

evasion trojan

Disable or Modify Tools

T1562.001

Modify Registry

T1112

description	ioc	Process
Set value (int)	\REGISTRY\MACHINE\SOFTWARE\Microsoft\Windows Defender\Exclusions\Paths\C:\Windows\SysWOW64\mrepelfj = "0"	svchost.exe

Creates new service(s) 1 TTPs
persistence

Windows Service
T1543.003

Modifies Windows Firewall 1 TTPs 1 IoCs

evasion

Windows Service

T1543.003

pid	Process
2928	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\mrepelfj\ImagePath = "C:\\Windows\\SysWOW64\\mrepelfj\\wjvslydn.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2504	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
3060	wjvslydn.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 3060 set thread context of 2504	3060	wjvslydn.exe	42

Launches sc.exe 3 IoCs

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

pid	Process
2260	sc.exe
2036	sc.exe
2884	sc.exe

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

System Information Discovery
T1082

Suspicious use of WriteProcessMemory 30 IoCs

description	pid	Process	procid_target
PID 2720 wrote to memory of 2620	2720	504365551a406e82ac71872b066960e6.exe	27
PID 2720 wrote to memory of 2620	2720	504365551a406e82ac71872b066960e6.exe	27
PID 2720 wrote to memory of 2620	2720	504365551a406e82ac71872b066960e6.exe	27
PID 2720 wrote to memory of 2620	2720	504365551a406e82ac71872b066960e6.exe	27
PID 2720 wrote to memory of 2600	2720	504365551a406e82ac71872b066960e6.exe	30
PID 2720 wrote to memory of 2600	2720	504365551a406e82ac71872b066960e6.exe	30
PID 2720 wrote to memory of 2600	2720	504365551a406e82ac71872b066960e6.exe	30
PID 2720 wrote to memory of 2600	2720	504365551a406e82ac71872b066960e6.exe	30
PID 2720 wrote to memory of 2260	2720	504365551a406e82ac71872b066960e6.exe	33
PID 2720 wrote to memory of 2260	2720	504365551a406e82ac71872b066960e6.exe	33
PID 2720 wrote to memory of 2260	2720	504365551a406e82ac71872b066960e6.exe	33
PID 2720 wrote to memory of 2260	2720	504365551a406e82ac71872b066960e6.exe	33
PID 2720 wrote to memory of 2036	2720	504365551a406e82ac71872b066960e6.exe	35
PID 2720 wrote to memory of 2036	2720	504365551a406e82ac71872b066960e6.exe	35
PID 2720 wrote to memory of 2036	2720	504365551a406e82ac71872b066960e6.exe	35
PID 2720 wrote to memory of 2036	2720	504365551a406e82ac71872b066960e6.exe	35
PID 2720 wrote to memory of 2884	2720	504365551a406e82ac71872b066960e6.exe	37
PID 2720 wrote to memory of 2884	2720	504365551a406e82ac71872b066960e6.exe	37
PID 2720 wrote to memory of 2884	2720	504365551a406e82ac71872b066960e6.exe	37
PID 2720 wrote to memory of 2884	2720	504365551a406e82ac71872b066960e6.exe	37
PID 2720 wrote to memory of 2928	2720	504365551a406e82ac71872b066960e6.exe	39
PID 2720 wrote to memory of 2928	2720	504365551a406e82ac71872b066960e6.exe	39
PID 2720 wrote to memory of 2928	2720	504365551a406e82ac71872b066960e6.exe	39
PID 2720 wrote to memory of 2928	2720	504365551a406e82ac71872b066960e6.exe	39
PID 3060 wrote to memory of 2504	3060	wjvslydn.exe	42
PID 3060 wrote to memory of 2504	3060	wjvslydn.exe	42
PID 3060 wrote to memory of 2504	3060	wjvslydn.exe	42
PID 3060 wrote to memory of 2504	3060	wjvslydn.exe	42
PID 3060 wrote to memory of 2504	3060	wjvslydn.exe	42
PID 3060 wrote to memory of 2504	3060	wjvslydn.exe	42

C:\Users\Admin\AppData\Local\Temp\504365551a406e82ac71872b066960e6.exe
"C:\Users\Admin\AppData\Local\Temp\504365551a406e82ac71872b066960e6.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:2720
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\mrepelfj\
  2⤵
  PID:2620
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\wjvslydn.exe" C:\Windows\SysWOW64\mrepelfj\
  2⤵
  PID:2600
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create mrepelfj binPath= "C:\Windows\SysWOW64\mrepelfj\wjvslydn.exe /d\"C:\Users\Admin\AppData\Local\Temp\504365551a406e82ac71872b066960e6.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2260
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description mrepelfj "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2036
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start mrepelfj
  2⤵
  - Launches sc.exe
  PID:2884
- 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
  PID:2928

C:\Windows\SysWOW64\mrepelfj\wjvslydn.exe
C:\Windows\SysWOW64\mrepelfj\wjvslydn.exe /d"C:\Users\Admin\AppData\Local\Temp\504365551a406e82ac71872b066960e6.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:3060
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2504

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

T1547

Registry Run Keys / Startup Folder

T1547.001

Create or Modify System Process

T1543

Windows Service

T1543.003

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

Defense Evasion

Impair Defenses

T1562

Disable or Modify Tools

T1562.001

Modify Registry

T1112

Credential Access

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\wjvslydn.exe

Filesize
4.1MB

MD5
610550c228929d6dbbbbd282d1cb5bd3

SHA1
f4cc507c053e958af374b3d0d24f7b096af4b2b9

SHA256
d884b89b82e1f875852bacc9f4044aa73317b5709c3cecd65349afda8cf725e8

SHA512
eff923b267b0db4e6083505e17cb69812b7d82597222e06fb119eb34e8bc0a5afc2923ac5e0b12b313c854facce70786f8314357c9553561a19af63873c08f71

Download Submit
C:\Windows\SysWOW64\mrepelfj\wjvslydn.exe

Filesize
1.6MB

MD5
a2f05d3bb364c214f574c5cfe4ef799b

SHA1
c55d2337db07fe626e7d528b4167a1a83a1db604

SHA256
27de5e69e79528b550d39e11f5797788bcdda4f9e35af2a7db03b59b666871ae

SHA512
db847764985b3953bf55d931ed349af77444f84ec0c012b7ee6fde1d7431d14abfbffe1c57e864669a4a38c8a240f1fb5b1eb333e00fc62936c091ad42442849

Download Submit
memory/2504-20-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2504-22-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2504-15-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2504-13-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2504-12-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2504-21-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2720-3-0x0000000000400000-0x0000000000472000-memory.dmp

Filesize
456KB

Download
memory/2720-2-0x0000000000020000-0x0000000000033000-memory.dmp

Filesize
76KB

Download
memory/2720-6-0x0000000000400000-0x0000000000472000-memory.dmp

Filesize
456KB

Download
memory/2720-7-0x0000000000020000-0x0000000000033000-memory.dmp

Filesize
76KB

Download
memory/2720-1-0x0000000000520000-0x0000000000620000-memory.dmp

Filesize
1024KB

Download
memory/3060-11-0x0000000000400000-0x0000000000472000-memory.dmp

Filesize
456KB

Download
memory/3060-17-0x0000000000400000-0x0000000000472000-memory.dmp

Filesize
456KB

Download
memory/3060-10-0x0000000000250000-0x0000000000350000-memory.dmp

Filesize
1024KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads