quasar | 0c904ce53aeca5d0e078e752c24dc3bed47b74d22f9158b6b4fb56d55c178ae0

Analysis

max time kernel
109s
max time network
152s
platform
windows10-2004_x64
resource
win10v2004-20241007-en
resource tags

arch:x64arch:x86image:win10v2004-20241007-enlocale:en-usos:windows10-2004-x64system
submitted
19-12-2024 11:37

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General

Target

viltracoin-qt.exe
Size

82.5MB
MD5

959a666390a5dcad9994b132fd286ef8
SHA1

a2d17928f1e7178c25fe0dd07bdb3f2bd9f6c4ca
SHA256

4feb1b58d3941d021d0525cf544ea5df9fc3e3ed3d32a621801072ad3a5a4da8
SHA512

fcbe47048a4448c51b042832c8ff2766798682fb7cf4ce68e2b1523d6f14f39b1a43c7f3eec28005314c22e86060d476552606900e382c5c425abc729877b946
SSDEEP

393216:34TPZVLWruiFVks+9j54GXvitZQLCO5SXDqQu58EISEhoIaE2FShABZDv25PPa2X:3KRVQxhu0P8Lq1LEvxOOx5Sh

Score

10^/10

quasar viltrac defense_evasion execution spyware trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Viltrac

51.15.17.193:4782

Mutex

d099b659-69af-41e2-9d7f-a5e64da5be06

Attributes

encryption_key
97599F6E5D14A784CC4DD36B18A277119042FDA8
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Quasar Client Startup
subdirectory
SubDir

Signatures

Quasar RAT
Quasar is an open source Remote Access Tool.
trojan spyware quasar
Quasar family
quasar

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/4736-39-0x0000024874020000-0x0000024874344000-memory.dmp	family_quasar

System Binary Proxy Execution: Regsvcs/Regasm 1 TTPs 2 IoCs

Abuse Regasm to proxy execution of malicious code.

defense_evasion

Regsvcs/Regasm

T1218.009

description	ioc	Process
File created	C:\Users\Admin\AppData\Local\Temp\RegAsm.exe	viltracoin-qt.exe
Key opened	\Registry\Machine\Software\Microsoft\Windows NT\CurrentVersion\AppCompatFlags\Custom\RegAsm.exe	cmd.exe

Drops startup file 1 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\tempup.url	viltracoin-qt.exe

Executes dropped EXE 1 IoCs

pid	Process
4736	RegAsm.exe

Command and Scripting Interpreter: PowerShell 1 TTPs 1 IoCs

Using powershell.exe command.

execution

PowerShell

T1059.001

pid	Process
1848	powershell.exe

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
1848	powershell.exe
1848	powershell.exe

Suspicious use of AdjustPrivilegeToken 2 IoCs

description	pid	Process
Token: SeDebugPrivilege	1848	powershell.exe
Token: SeDebugPrivilege	4736	RegAsm.exe

Suspicious use of WriteProcessMemory 16 IoCs

description	pid	Process	procid_target
PID 3972 wrote to memory of 540	3972	viltracoin-qt.exe	85
PID 3972 wrote to memory of 540	3972	viltracoin-qt.exe	85
PID 540 wrote to memory of 2772	540	cmd.exe	86
PID 540 wrote to memory of 2772	540	cmd.exe	86
PID 540 wrote to memory of 1848	540	cmd.exe	87
PID 540 wrote to memory of 1848	540	cmd.exe	87
PID 1848 wrote to memory of 4668	1848	powershell.exe	89
PID 1848 wrote to memory of 4668	1848	powershell.exe	89
PID 4668 wrote to memory of 4396	4668	csc.exe	90
PID 4668 wrote to memory of 4396	4668	csc.exe	90
PID 3972 wrote to memory of 3892	3972	viltracoin-qt.exe	91
PID 3972 wrote to memory of 3892	3972	viltracoin-qt.exe	91
PID 3892 wrote to memory of 4736	3892	cmd.exe	92
PID 3892 wrote to memory of 4736	3892	cmd.exe	92
PID 3972 wrote to memory of 1452	3972	viltracoin-qt.exe	94
PID 3972 wrote to memory of 1452	3972	viltracoin-qt.exe	94

C:\Users\Admin\AppData\Local\Temp\viltracoin-qt.exe
"C:\Users\Admin\AppData\Local\Temp\viltracoin-qt.exe"
1⤵
- System Binary Proxy Execution: Regsvcs/Regasm
- Drops startup file
- Suspicious use of WriteProcessMemory
PID:3972
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /d /s /c "type C:\Users\Admin\AppData\Local\Temp\temp.ps1 | powershell.exe -noprofile -"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:540
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /S /D /c" type C:\Users\Admin\AppData\Local\Temp\temp.ps1 "
    3⤵
    PID:2772
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    powershell.exe -noprofile -
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:1848
  - - C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe
      "C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe" /noconfig /fullpaths @"C:\Users\Admin\AppData\Local\Temp\je22ajmj\je22ajmj.cmdline"
      4⤵
      Suspicious use of WriteProcessMemory
      PID:4668
    - - C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe
        
        C:\Windows\Microsoft.NET\Framework64\v4.0.30319\cvtres.exe /NOLOGO /READONLY /MACHINE:IX86 "/OUT:C:\Users\Admin\AppData\Local\Temp\RESC42B.tmp" "c:\Users\Admin\AppData\Local\Temp\je22ajmj\CSC8028FE7D6A684DCA87BAAF435C1AF8.TMP"
        5⤵
        
        PID:4396
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /d /s /c "C:\Users\Admin\AppData\Local\Temp\RegAsm.exe"
  2⤵
  - System Binary Proxy Execution: Regsvcs/Regasm
  - Suspicious use of WriteProcessMemory
  PID:3892
- - C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
    C:\Users\Admin\AppData\Local\Temp\RegAsm.exe
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:4736
- C:\Windows\system32\cmd.exe
  C:\Windows\system32\cmd.exe /d /s /c "C:\Users\Admin\AppData\Local\Temp\viltracoin-qt1.exe"
  2⤵
  PID:1452

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Persistence

Privilege Escalation

Defense Evasion

System Binary Proxy Execution

T1218

Regsvcs/Regasm

T1218.009

Credential Access

Discovery

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\RESC42B.tmp

Filesize
1KB

MD5
41dfa2da75cda8d608c0926a6e06eb20

SHA1
8d5bd5a948eb9348e68e37ac474309f81a65023c

SHA256
0528214eab53c8be31118b93a2479447f40aa5bc35759de34fc728eb627f6ceb

SHA512
d0e4bf421761d4f55bd9bef8856ebcf1177c5a51f777b979871d309c245317a2837ca2dbd19b45a89b5bc0fa3161977374f1fbb1675c770f6ad0cbd66805fc86

Download Submit
C:\Users\Admin\AppData\Local\Temp\RegAsm.exe

Filesize
4.7MB

MD5
2884a477526c8308e9492845449e7e55

SHA1
eee9ad47bffe627c71529e81bf9daaf95ee3df30

SHA256
55c5b0b62609618558f51c5f35380291a4337cae8b14e65dd5ce7b226e9e4096

SHA512
d4e3694af590f82a1464e403c05c4f7ed34dcd9a91b5b4930d72ae406625952f332b22f3a15aba4a2a412b1967ccb09a7383d2c4140752a1b296e9326f89b5f3

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ma1ihves.bev.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\je22ajmj\je22ajmj.dll

Filesize
3KB

MD5
eb46cc11e450faf2b903cbbdfe3f8d3b

SHA1
571042b3faf5063c1c6e9ef0de2ce26cbec7c7b1

SHA256
39be4e76b7e587a0c6a097755dc325a44a5dadd2bdd2839c748400cd73ab67a8

SHA512
328c7fd42b22a1af2a25ed02b90e20ad3836afd68005bdbef6c7cb6d38b027b8819da84023109ded7463fad6828cafac5ffbbdaf5805075bef43a212a1c0333b

Download Submit
C:\Users\Admin\AppData\Local\Temp\temp.ps1

Filesize
379B

MD5
18047e197c6820559730d01035b2955a

SHA1
277179be54bba04c0863aebd496f53b129d47464

SHA256
348342fd00e113a58641b2c35dd6a8f2c1fb2f1b16d8dff9f77b05f29e229ef3

SHA512
1942acd6353310623561efb33d644ba45ab62c1ddfabb1a1b3b1dd93f7d03df0884e2f2fc927676dc3cd3b563d159e3043d2eff81708c556431be9baf4ccb877

Download Submit
C:\Users\Admin\AppData\Local\Temp\viltracoin-qt1.exe

Filesize
2KB

MD5
e53fdf76753edcd8773ab17ae968bfd6

SHA1
4bea38cd83442080bdf51cd1db206715f9198955

SHA256
3d70ce95eb1eb78620cc57fe1a6a479e6f2d70508bf813238e573863df000d6e

SHA512
f168878f0d1047ce3775a511ee5cffed3afc7a47081304b4c884b6099dace99a17e473b727f5afcc87b0e0c1df461439f821b2dbcf341f94b9c206e8487c7888

Download Submit
\??\c:\Users\Admin\AppData\Local\Temp\je22ajmj\CSC8028FE7D6A684DCA87BAAF435C1AF8.TMP

Filesize
652B

MD5
0d367b4138b11758cdd4f8d33a5f8350

SHA1
e83527886bfd55459ffbbb18508c45790ae10bfa

SHA256
86570cba06bf47859a3632b6b75450b7d652c36ce8272cce98537fc74b3e95cb

SHA512
82bd1132fa96430d83200a2e719be6e00084a315eaddf61eaa810f3cb77906a602f2eb120a4b06fd1b84d04bda6429c5783147ef2b6f2cca8eac036b2d1de6ab

Download Submit
\??\c:\Users\Admin\AppData\Local\Temp\je22ajmj\je22ajmj.0.cs

Filesize
311B

MD5
7bc8de6ac8041186ed68c07205656943

SHA1
673f31957ab1b6ad3dc769e86aedc7ed4b4e0a75

SHA256
36865e3bca9857e07b1137ada07318b9caaef9608256a6a6a7fd426ee03e1697

SHA512
0495839c79597e81d447672f8e85b03d0401f81c7b2011a830874c33812c54dab25b0f89a202bbb71abb4ffc7cb2c07cc37c008b132d4d5d796aebdd12741dba

Download Submit
\??\c:\Users\Admin\AppData\Local\Temp\je22ajmj\je22ajmj.cmdline

Filesize
369B

MD5
025527d58affc23bb4fbcb2fe11879cb

SHA1
81ba3d7dd75fc1755d8a3ea68ab8d7c869110362

SHA256
7c876664ee813017fec0f9d70aaa647fe5d410f9b9f0c0c8a1a4af919abcfa37

SHA512
02d7143fb6548334f217ed2f851f2cf4ad92dd0c1a8365fe1c19889a1fecce580f927fda97251bd4105a0ce9926f13447b91cb2dd5f367ea175a83ee3491a2d8

Download Submit
memory/1848-14-0x0000011DA8510000-0x0000011DA8586000-memory.dmp

Filesize
472KB

Download
memory/1848-27-0x0000011DA8090000-0x0000011DA8098000-memory.dmp

Filesize
32KB

Download
memory/1848-13-0x0000011DA8440000-0x0000011DA8484000-memory.dmp

Filesize
272KB

Download
memory/1848-9-0x0000011DA7F40000-0x0000011DA7F62000-memory.dmp

Filesize
136KB

Download
memory/4736-39-0x0000024874020000-0x0000024874344000-memory.dmp

Filesize
3.1MB

Download
memory/4736-40-0x00000248743F0000-0x0000024874440000-memory.dmp

Filesize
320KB

Download
memory/4736-41-0x0000024874A40000-0x0000024874AF2000-memory.dmp

Filesize
712KB

Download
memory/4736-44-0x0000024874440000-0x0000024874452000-memory.dmp

Filesize
72KB

Download
memory/4736-45-0x0000024874980000-0x00000248749BC000-memory.dmp

Filesize
240KB

Download