tofsee | 97cdf05ecaca6f4bc5fe05ca83223647d08e4e34ee404894f782922bf8c28695

Analysis

max time kernel
146s
max time network
122s
platform
windows7_x64
resource
win7-20231215-en
resource tags

arch:x64arch:x86image:win7-20231215-enlocale:en-usos:windows7-x64system
submitted
19/12/2023, 13:01

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General

Target

2bfe97448f961f9b64400e2ee3731ce5.exe
Size

11.1MB
MD5

2bfe97448f961f9b64400e2ee3731ce5
SHA1

9b37b78546fdcab84b1849cb7707675861ceb3f0
SHA256

97cdf05ecaca6f4bc5fe05ca83223647d08e4e34ee404894f782922bf8c28695
SHA512

5c305a3cdb8ca939876170be2e6988957446ff0ee1dedcf2a760730972d9c798b7ff9171a1613da7c415bf1688efd80285051778a60c174584fa2fb74271c54d
SSDEEP

6144:CM0Em6Qk5N3ScccccccccccccccccccccccccccccccccccccccccccccccccccM:sEma

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\dkwfgexq = "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
2596	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\dkwfgexq\ImagePath = "C:\\Windows\\SysWOW64\\dkwfgexq\\yuouacul.exe"	svchost.exe

Deletes itself 1 IoCs

pid	Process
2604	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
2872	yuouacul.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 2872 set thread context of 2604	2872	yuouacul.exe	41

Launches sc.exe 3 IoCs

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

pid	Process
2844	sc.exe
2700	sc.exe
2768	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 3040 wrote to memory of 2748	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	28
PID 3040 wrote to memory of 2748	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	28
PID 3040 wrote to memory of 2748	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	28
PID 3040 wrote to memory of 2748	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	28
PID 3040 wrote to memory of 2664	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	30
PID 3040 wrote to memory of 2664	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	30
PID 3040 wrote to memory of 2664	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	30
PID 3040 wrote to memory of 2664	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	30
PID 3040 wrote to memory of 2844	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	32
PID 3040 wrote to memory of 2844	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	32
PID 3040 wrote to memory of 2844	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	32
PID 3040 wrote to memory of 2844	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	32
PID 3040 wrote to memory of 2700	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	34
PID 3040 wrote to memory of 2700	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	34
PID 3040 wrote to memory of 2700	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	34
PID 3040 wrote to memory of 2700	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	34
PID 3040 wrote to memory of 2768	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	36
PID 3040 wrote to memory of 2768	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	36
PID 3040 wrote to memory of 2768	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	36
PID 3040 wrote to memory of 2768	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	36
PID 3040 wrote to memory of 2596	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	39
PID 3040 wrote to memory of 2596	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	39
PID 3040 wrote to memory of 2596	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	39
PID 3040 wrote to memory of 2596	3040	2bfe97448f961f9b64400e2ee3731ce5.exe	39
PID 2872 wrote to memory of 2604	2872	yuouacul.exe	41
PID 2872 wrote to memory of 2604	2872	yuouacul.exe	41
PID 2872 wrote to memory of 2604	2872	yuouacul.exe	41
PID 2872 wrote to memory of 2604	2872	yuouacul.exe	41
PID 2872 wrote to memory of 2604	2872	yuouacul.exe	41
PID 2872 wrote to memory of 2604	2872	yuouacul.exe	41

C:\Users\Admin\AppData\Local\Temp\2bfe97448f961f9b64400e2ee3731ce5.exe
"C:\Users\Admin\AppData\Local\Temp\2bfe97448f961f9b64400e2ee3731ce5.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:3040
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\dkwfgexq\
  2⤵
  PID:2748
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\yuouacul.exe" C:\Windows\SysWOW64\dkwfgexq\
  2⤵
  PID:2664
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create dkwfgexq binPath= "C:\Windows\SysWOW64\dkwfgexq\yuouacul.exe /d\"C:\Users\Admin\AppData\Local\Temp\2bfe97448f961f9b64400e2ee3731ce5.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:2844
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description dkwfgexq "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:2700
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start dkwfgexq
  2⤵
  - Launches sc.exe
  PID:2768
- 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:2596

C:\Windows\SysWOW64\dkwfgexq\yuouacul.exe
C:\Windows\SysWOW64\dkwfgexq\yuouacul.exe /d"C:\Users\Admin\AppData\Local\Temp\2bfe97448f961f9b64400e2ee3731ce5.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2872
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Windows security bypass
  - Sets service image path in registry
  - Deletes itself
  PID:2604

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\yuouacul.exe

Filesize
11.9MB

MD5
8d750b3c3cc8dc4227caac8a0d0e002b

SHA1
944706c7b2e0c19e00717a055feced6a45105cfa

SHA256
4104b983e44ed1282ee134c9c4adb154ab8eaa567312438bcff1520b6d4e87c1

SHA512
72dc679851242d14d6bbacd2e8920547e8f0e9c8fb82f4f759f1f3c3865434e0ebd1b092fa496468c2dec57d8d4d6f9cf8463890529f4fc8ff9fc1322b973d6d

Download Submit
C:\Windows\SysWOW64\dkwfgexq\yuouacul.exe

Filesize
4.8MB

MD5
435dcb2dddbd18f83191b6a5dda100b7

SHA1
6349971c5173777938ff839ee9350eebe449606b

SHA256
a5c77ff4cbacb1a03458129de6ae7dc481f30e3e40b0680337d8a50002a51814

SHA512
db324ca73d830fcfdcb9c7d67688930266d4424326c1cb20a3b9d5c3937544b3c23a5452bd57062f8c16f88ab2d63506ae3534313a5bf9c8b260ed31748aca21

Download Submit
memory/2604-12-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2604-10-0x000000007EFDE000-0x000000007EFDF000-memory.dmp

Filesize
4KB

Download
memory/2604-9-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2604-16-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2604-17-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2604-18-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2604-19-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/2872-8-0x00000000003B0000-0x00000000003B1000-memory.dmp

Filesize
4KB

Download
memory/2872-13-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3040-2-0x00000000002C0000-0x00000000002C1000-memory.dmp

Filesize
4KB

Download
memory/3040-0-0x00000000002B0000-0x00000000002B1000-memory.dmp

Filesize
4KB

Download
memory/3040-5-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/3040-1-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads