tofsee | 3254b338c3d8a9ed898c84d8d69742d0564289eb6a8cbceb6a9de45a12e42d14

Analysis

max time kernel
144s
max time network
123s
platform
windows10-2004_x64
resource
win10v2004-20231215-en
resource tags

arch:x64arch:x86image:win10v2004-20231215-enlocale:en-usos:windows10-2004-x64system
submitted
15/01/2024, 05:06

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General

Target
5c35fea681df97b50e0d86afc84e626b.exe
Size 10.7MB
Sample240115-frh7eahhfl
SHA256 3254b338c3d8a9ed898c84d8d69742d0564289eb6a8cbceb6a9de45a12e42d14
MD5 5c35fea681df97b50e0d86afc84e626b
SHA1 b8e4c53b06fafc704a2198258405184fa2735d3c
SHA512 d8e1a29ffdcf07ff1327bd12e031b8e4b3d9a358e490b213eb055ac9419342435370e92acd46278ca93b144b699dd300e8dda7a920a7d7273de669aaad70ed64
SSDEEP 49152:Rjrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr:p
MD5 SHA1 SHA512 SSDEEP

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
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
3684	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\rnyukokg\ImagePath = "C:\\Windows\\SysWOW64\\rnyukokg\\lymprrpc.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-1-5-21-1497073144-2389943819-3385106915-1000\Control Panel\International\Geo\Nation	5c35fea681df97b50e0d86afc84e626b.exe

Deletes itself 1 IoCs

pid	Process
336	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
4240	lymprrpc.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 4240 set thread context of 336	4240	lymprrpc.exe	102

Launches sc.exe 3 IoCs

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

pid	Process
1540	sc.exe
4428	sc.exe
2416	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 23 IoCs

description	pid	Process	procid_target
PID 1576 wrote to memory of 3408	1576	5c35fea681df97b50e0d86afc84e626b.exe	89
PID 1576 wrote to memory of 3408	1576	5c35fea681df97b50e0d86afc84e626b.exe	89
PID 1576 wrote to memory of 3408	1576	5c35fea681df97b50e0d86afc84e626b.exe	89
PID 1576 wrote to memory of 4716	1576	5c35fea681df97b50e0d86afc84e626b.exe	92
PID 1576 wrote to memory of 4716	1576	5c35fea681df97b50e0d86afc84e626b.exe	92
PID 1576 wrote to memory of 4716	1576	5c35fea681df97b50e0d86afc84e626b.exe	92
PID 1576 wrote to memory of 1540	1576	5c35fea681df97b50e0d86afc84e626b.exe	94
PID 1576 wrote to memory of 1540	1576	5c35fea681df97b50e0d86afc84e626b.exe	94
PID 1576 wrote to memory of 1540	1576	5c35fea681df97b50e0d86afc84e626b.exe	94
PID 1576 wrote to memory of 4428	1576	5c35fea681df97b50e0d86afc84e626b.exe	95
PID 1576 wrote to memory of 4428	1576	5c35fea681df97b50e0d86afc84e626b.exe	95
PID 1576 wrote to memory of 4428	1576	5c35fea681df97b50e0d86afc84e626b.exe	95
PID 1576 wrote to memory of 2416	1576	5c35fea681df97b50e0d86afc84e626b.exe	99
PID 1576 wrote to memory of 2416	1576	5c35fea681df97b50e0d86afc84e626b.exe	99
PID 1576 wrote to memory of 2416	1576	5c35fea681df97b50e0d86afc84e626b.exe	99
PID 4240 wrote to memory of 336	4240	lymprrpc.exe	102
PID 4240 wrote to memory of 336	4240	lymprrpc.exe	102
PID 4240 wrote to memory of 336	4240	lymprrpc.exe	102
PID 4240 wrote to memory of 336	4240	lymprrpc.exe	102
PID 4240 wrote to memory of 336	4240	lymprrpc.exe	102
PID 1576 wrote to memory of 3684	1576	5c35fea681df97b50e0d86afc84e626b.exe	104
PID 1576 wrote to memory of 3684	1576	5c35fea681df97b50e0d86afc84e626b.exe	104
PID 1576 wrote to memory of 3684	1576	5c35fea681df97b50e0d86afc84e626b.exe	104

C:\Users\Admin\AppData\Local\Temp\5c35fea681df97b50e0d86afc84e626b.exe
"C:\Users\Admin\AppData\Local\Temp\5c35fea681df97b50e0d86afc84e626b.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:1576
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\rnyukokg\
  2⤵
  PID:3408
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\lymprrpc.exe" C:\Windows\SysWOW64\rnyukokg\
  2⤵
  PID:4716
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create rnyukokg binPath= "C:\Windows\SysWOW64\rnyukokg\lymprrpc.exe /d\"C:\Users\Admin\AppData\Local\Temp\5c35fea681df97b50e0d86afc84e626b.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:1540
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description rnyukokg "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4428
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start rnyukokg
  2⤵
  - Launches sc.exe
  PID:2416
- 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:3684

C:\Windows\SysWOW64\rnyukokg\lymprrpc.exe
C:\Windows\SysWOW64\rnyukokg\lymprrpc.exe /d"C:\Users\Admin\AppData\Local\Temp\5c35fea681df97b50e0d86afc84e626b.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:4240
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:336

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

Modify Registry

T1112

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

lymprrpc.exe

Path C:\Users\Admin\AppData\Local\Temp\lymprrpc.exe
Size 4.0MB
SHA256 d83856dfeff36ebd222f733b5d27143c2c0e3c60224008cad7aa3039d4f56cec
MD5 09645b19219144c95c8b51d32be1e7e9
SHA1 49786a523e0e5f54a5fd161e70e8f34ca86f38eb
SHA512 bb774662bd8a2b41c51e4598fa1f331308949dc01e70caa15567b140c6d554b0d8f2121e09cb3040f7770aa9358f9e2802a0d1e6ef864dac40a1ffe9a0e5186f
SSDEEP 49152:rjrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrq:+
MD5 SHA1 SHA512 SSDEEP

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lymprrpc.exe

Path C:\Windows\SysWOW64\rnyukokg\lymprrpc.exe
Size 451KB
SHA256 c10b20c28dd64c3ed67e750b0014a0e15dde83647cee7120005dbd14015809e3
MD5 fdf682d5b7320d12a0d94d020c896f0f
SHA1 aa4e89ce742b2afa1875d43e2b2d180ecf033760
SHA512 306193d1c4297396001b67dfdb4e14e87b4b084e020338230acd41d4abda564407aec30d52f49259ebd6e1e7206d8aa1651855681daad2d2895c295fcc254c65
SSDEEP 12288:7o6VZ3YyFD/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D/D:rmMrrrrrrrrrrrrrrrrrrrrrrrrrrrrD
MD5 SHA1 SHA512 SSDEEP

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memory/336-9-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

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memory/336-13-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

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memory/336-15-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

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memory/336-16-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

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memory/336-17-0x0000000000FC0000-0x0000000000FD5000-memory.dmp

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memory/1576-1-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/1576-2-0x00000000005C0000-0x00000000005C1000-memory.dmp

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memory/1576-3-0x00000000005D0000-0x00000000005D1000-memory.dmp

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memory/1576-0-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/1576-14-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/4240-7-0x0000000000400000-0x000000000041E000-memory.dmp

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memory/4240-12-0x0000000000400000-0x000000000041E000-memory.dmp

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Analysis

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General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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