tofsee | 97cdf05ecaca6f4bc5fe05ca83223647d08e4e34ee404894f782922bf8c28695

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

C2

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
1540	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\bywzvmzv\ImagePath = "C:\\Windows\\SysWOW64\\bywzvmzv\\dyfcbyuv.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-1-5-21-3073191680-435865314-2862784915-1000\Control Panel\International\Geo\Nation	2bfe97448f961f9b64400e2ee3731ce5.exe

Deletes itself 1 IoCs

pid	Process
952	svchost.exe

Executes dropped EXE 1 IoCs

pid	Process
636	dyfcbyuv.exe

Suspicious use of SetThreadContext 1 IoCs

description	pid	Process	procid_target
PID 636 set thread context of 952	636	dyfcbyuv.exe	104

Launches sc.exe 3 IoCs

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

pid	Process
4896	sc.exe
4040	sc.exe
4324	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 4692 wrote to memory of 3312	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	91
PID 4692 wrote to memory of 3312	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	91
PID 4692 wrote to memory of 3312	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	91
PID 4692 wrote to memory of 3764	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	93
PID 4692 wrote to memory of 3764	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	93
PID 4692 wrote to memory of 3764	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	93
PID 4692 wrote to memory of 4896	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	95
PID 4692 wrote to memory of 4896	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	95
PID 4692 wrote to memory of 4896	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	95
PID 4692 wrote to memory of 4040	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	97
PID 4692 wrote to memory of 4040	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	97
PID 4692 wrote to memory of 4040	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	97
PID 4692 wrote to memory of 4324	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	99
PID 4692 wrote to memory of 4324	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	99
PID 4692 wrote to memory of 4324	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	99
PID 4692 wrote to memory of 1540	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	101
PID 4692 wrote to memory of 1540	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	101
PID 4692 wrote to memory of 1540	4692	2bfe97448f961f9b64400e2ee3731ce5.exe	101
PID 636 wrote to memory of 952	636	dyfcbyuv.exe	104
PID 636 wrote to memory of 952	636	dyfcbyuv.exe	104
PID 636 wrote to memory of 952	636	dyfcbyuv.exe	104
PID 636 wrote to memory of 952	636	dyfcbyuv.exe	104
PID 636 wrote to memory of 952	636	dyfcbyuv.exe	104

C:\Users\Admin\AppData\Local\Temp\2bfe97448f961f9b64400e2ee3731ce5.exe
"C:\Users\Admin\AppData\Local\Temp\2bfe97448f961f9b64400e2ee3731ce5.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4692
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\bywzvmzv\
  2⤵
  PID:3312
- C:\Windows\SysWOW64\cmd.exe
  "C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\dyfcbyuv.exe" C:\Windows\SysWOW64\bywzvmzv\
  2⤵
  PID:3764
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" create bywzvmzv binPath= "C:\Windows\SysWOW64\bywzvmzv\dyfcbyuv.exe /d\"C:\Users\Admin\AppData\Local\Temp\2bfe97448f961f9b64400e2ee3731ce5.exe\"" type= own start= auto DisplayName= "wifi support"
  2⤵
  - Launches sc.exe
  PID:4896
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" description bywzvmzv "wifi internet conection"
  2⤵
  - Launches sc.exe
  PID:4040
- C:\Windows\SysWOW64\sc.exe
  "C:\Windows\System32\sc.exe" start bywzvmzv
  2⤵
  - Launches sc.exe
  PID:4324
- 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:1540

C:\Windows\SysWOW64\bywzvmzv\dyfcbyuv.exe
C:\Windows\SysWOW64\bywzvmzv\dyfcbyuv.exe /d"C:\Users\Admin\AppData\Local\Temp\2bfe97448f961f9b64400e2ee3731ce5.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:636
- C:\Windows\SysWOW64\svchost.exe
  svchost.exe
  2⤵
  - Sets service image path in registry
  - Deletes itself
  PID:952

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Create or Modify System Process

2

T1543

Windows Service

2

T1543.003

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

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

Filesize
13.2MB

MD5
2ebd294b687bf8fc05ffba5bcb44b57b

SHA1
d197c1f4667c0f45aa246e477e8a46c676de061e

SHA256
2380f68e91fadad2706481482f4d863cdc50d05d4e0041c47d6c6f0e8db38825

SHA512
f79ae974fc18eca543d3ae91dff977d6776ad98fc5ea60ce4e6567d50518dc0de15669abe199efd39fc884a90c1b8b67c031c0fcdb4e99c9694fd38320e4be87

Download Submit
memory/636-8-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/636-9-0x00000000004A0000-0x00000000004A1000-memory.dmp

Filesize
4KB

Download
memory/636-11-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/952-10-0x0000000000390000-0x00000000003A5000-memory.dmp

Filesize
84KB

Download
memory/952-13-0x0000000000390000-0x00000000003A5000-memory.dmp

Filesize
84KB

Download
memory/952-15-0x0000000000390000-0x00000000003A5000-memory.dmp

Filesize
84KB

Download
memory/952-16-0x0000000000390000-0x00000000003A5000-memory.dmp

Filesize
84KB

Download
memory/952-17-0x0000000000390000-0x00000000003A5000-memory.dmp

Filesize
84KB

Download
memory/4692-2-0x00000000005D0000-0x00000000005D1000-memory.dmp

Filesize
4KB

Download
memory/4692-0-0x00000000005C0000-0x00000000005C1000-memory.dmp

Filesize
4KB

Download
memory/4692-5-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4692-6-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/4692-1-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads