tofsee | 12c8a5d0074b51c3d799ef722a7d97e7e1490529064759ef5932e0e76f28bf7e

General

Target

file.exe
Size

350KB
MD5

38e3f0f985ad66154c83f39a43c7b499
SHA1

c2082df23b60440e5e5661feab6001183c79c299
SHA256

12c8a5d0074b51c3d799ef722a7d97e7e1490529064759ef5932e0e76f28bf7e
SHA512

c955c141ca47679985da8cce632d0bcc6572956d5a19918061afc64067acda98f180385837c302e0e76e0386a06db085175131ee52569a3fb324becf795a19ce
SSDEEP

6144:G3gLadmInlyjX3m3iCww4ek4NYpIlIwassuYQuRjMgU:Gw2dHcjX3m3iC9SEYpIlHaBpdRQg

Score

10^/10

tofsee evasion persistence trojan

Malware Config

Extracted

Family

tofsee

C2

svartalfheim.top

jotunheim.name

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

Disabling Security Tools

T1089

Modify Registry

T1112

Processes:

svchost.exe

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

Creates new service(s) 1 TTPs
persistence

New Service
T1050
Executes dropped EXE 1 IoCs

Processes:

eplqhamb.exe

pid process

2028 eplqhamb.exe
Modifies Windows Firewall 1 TTPs 1 IoCs
evasion

Modify Existing Service
T1031

Processes:

netsh.exe

pid process

276 netsh.exe

pid	process
2028	eplqhamb.exe

pid	process
276	netsh.exe

Sets service image path in registry 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1060

Modify Registry

T1112

Processes:

svchost.exe

description	ioc	process
Set value (str)	\REGISTRY\MACHINE\SYSTEM\ControlSet001\services\aerxhqst\ImagePath = "C:\\Windows\\SysWOW64\\aerxhqst\\eplqhamb.exe"	svchost.exe

Deletes itself 1 IoCs

Processes:

svchost.exe

pid process

1572 svchost.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

eplqhamb.exe

description pid process target process

PID 2028 set thread context of 1572 2028 eplqhamb.exe svchost.exe
Launches sc.exe 3 IoCs
Sc.exe is a Windows utlilty to control services on the system.

Processes:

sc.exesc.exesc.exe

pid process

560 sc.exe
1676 sc.exe
1212 sc.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082

pid	process
1572	svchost.exe

description	pid	process	target process
PID 2028 set thread context of 1572	2028	eplqhamb.exe	svchost.exe

pid	process
560	sc.exe
1676	sc.exe
1212	sc.exe

Suspicious use of WriteProcessMemory 30 IoCs

Processes:

file.exeeplqhamb.exe

description	pid	process	target process
PID 1208 wrote to memory of 820	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 820	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 820	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 820	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 992	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 992	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 992	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 992	1208	file.exe	cmd.exe
PID 1208 wrote to memory of 1212	1208	file.exe	sc.exe
PID 1208 wrote to memory of 1212	1208	file.exe	sc.exe
PID 1208 wrote to memory of 1212	1208	file.exe	sc.exe
PID 1208 wrote to memory of 1212	1208	file.exe	sc.exe
PID 1208 wrote to memory of 560	1208	file.exe	sc.exe
PID 1208 wrote to memory of 560	1208	file.exe	sc.exe
PID 1208 wrote to memory of 560	1208	file.exe	sc.exe
PID 1208 wrote to memory of 560	1208	file.exe	sc.exe
PID 1208 wrote to memory of 1676	1208	file.exe	sc.exe
PID 1208 wrote to memory of 1676	1208	file.exe	sc.exe
PID 1208 wrote to memory of 1676	1208	file.exe	sc.exe
PID 1208 wrote to memory of 1676	1208	file.exe	sc.exe
PID 1208 wrote to memory of 276	1208	file.exe	netsh.exe
PID 1208 wrote to memory of 276	1208	file.exe	netsh.exe
PID 1208 wrote to memory of 276	1208	file.exe	netsh.exe
PID 1208 wrote to memory of 276	1208	file.exe	netsh.exe
PID 2028 wrote to memory of 1572	2028	eplqhamb.exe	svchost.exe
PID 2028 wrote to memory of 1572	2028	eplqhamb.exe	svchost.exe
PID 2028 wrote to memory of 1572	2028	eplqhamb.exe	svchost.exe
PID 2028 wrote to memory of 1572	2028	eplqhamb.exe	svchost.exe
PID 2028 wrote to memory of 1572	2028	eplqhamb.exe	svchost.exe
PID 2028 wrote to memory of 1572	2028	eplqhamb.exe	svchost.exe

C:\Users\Admin\AppData\Local\Temp\file.exe
"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Suspicious use of WriteProcessMemory
PID:1208

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C mkdir C:\Windows\SysWOW64\aerxhqst\
2⤵
PID:820

C:\Windows\SysWOW64\cmd.exe
"C:\Windows\System32\cmd.exe" /C move /Y "C:\Users\Admin\AppData\Local\Temp\eplqhamb.exe" C:\Windows\SysWOW64\aerxhqst\
2⤵
PID:992

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" create aerxhqst binPath= "C:\Windows\SysWOW64\aerxhqst\eplqhamb.exe /d\"C:\Users\Admin\AppData\Local\Temp\file.exe\"" type= own start= auto DisplayName= "wifi support"
2⤵
- Launches sc.exe
PID:1212

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" description aerxhqst "wifi internet conection"
2⤵
- Launches sc.exe
PID:560

C:\Windows\SysWOW64\sc.exe
"C:\Windows\System32\sc.exe" start aerxhqst
2⤵
- Launches sc.exe
PID:1676

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:276

C:\Windows\SysWOW64\aerxhqst\eplqhamb.exe
C:\Windows\SysWOW64\aerxhqst\eplqhamb.exe /d"C:\Users\Admin\AppData\Local\Temp\file.exe"
1⤵
- Executes dropped EXE
- Suspicious use of SetThreadContext
- Suspicious use of WriteProcessMemory
PID:2028

C:\Windows\SysWOW64\svchost.exe
svchost.exe
2⤵
- Windows security bypass
- Sets service image path in registry
- Deletes itself
PID:1572

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

New Service

1

T1050

Modify Existing Service

1

T1031

Registry Run Keys / Startup Folder

1

T1060

Privilege Escalation

New Service

1

T1050

Defense Evasion

Disabling Security Tools

1

T1089

Modify Registry

2

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\eplqhamb.exe
Filesize
12.8MB

MD5
36e2517cc5b7fba951dee133f0853e73

SHA1
6ae7393253f7fa5d211a33544ecf46f44d844c3f

SHA256
4e6d6b4dfb3e750c2eb412090b1813cc5a0092acc6e93882650eac3991cc13e0

SHA512
adfd701e0f8c43abb8cf2bce3696f38ddb51b8794e2892ed5dfc2593063e8a72048921ac4d5dab01a16487dce8694c806b441b5069903cf264757d4a71a35a2f

Download Submit
C:\Windows\SysWOW64\aerxhqst\eplqhamb.exe
Filesize
12.8MB

MD5
36e2517cc5b7fba951dee133f0853e73

SHA1
6ae7393253f7fa5d211a33544ecf46f44d844c3f

SHA256
4e6d6b4dfb3e750c2eb412090b1813cc5a0092acc6e93882650eac3991cc13e0

SHA512
adfd701e0f8c43abb8cf2bce3696f38ddb51b8794e2892ed5dfc2593063e8a72048921ac4d5dab01a16487dce8694c806b441b5069903cf264757d4a71a35a2f

Download Submit
memory/276-65-0x0000000000000000-mapping.dmp

Download
memory/560-63-0x0000000000000000-mapping.dmp

Download
memory/820-58-0x0000000000000000-mapping.dmp

Download
memory/992-59-0x0000000000000000-mapping.dmp

Download
memory/1208-55-0x00000000005DA000-0x00000000005EF000-memory.dmp

Filesize
84KB

Download
memory/1208-60-0x00000000005DA000-0x00000000005EF000-memory.dmp

Filesize
84KB

Download
memory/1208-57-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/1208-54-0x0000000075141000-0x0000000075143000-memory.dmp

Filesize
8KB

Download
memory/1208-56-0x0000000000020000-0x0000000000033000-memory.dmp

Filesize
76KB

Download
memory/1208-66-0x00000000005DA000-0x00000000005EF000-memory.dmp

Filesize
84KB

Download
memory/1208-67-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/1212-61-0x0000000000000000-mapping.dmp

Download
memory/1572-71-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1572-73-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1572-74-0x0000000000089A6B-mapping.dmp

Download
memory/1572-80-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1572-81-0x0000000000080000-0x0000000000095000-memory.dmp

Filesize
84KB

Download
memory/1676-64-0x0000000000000000-mapping.dmp

Download
memory/2028-78-0x0000000000400000-0x000000000045D000-memory.dmp

Filesize
372KB

Download
memory/2028-75-0x00000000005FA000-0x000000000060F000-memory.dmp

Filesize
84KB

Download

Analysis

Sharing

General

Malware Config

Extracted

Signatures

Processes

Network

MITRE ATT&CK Matrix ATT&CK v6

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Downloads