quasar | abe621c37b2e40f6c6b3d9da15e37d4001188e10bac99e5d66c23cee23b98d03

Analysis

max time kernel
149s
max time network
151s
platform
windows10-2004_x64
resource
win10v2004-20240508-en
resource tags

arch:x64arch:x86image:win10v2004-20240508-enlocale:en-usos:windows10-2004-x64system
submitted
29/05/2024, 07:45

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General

Target
Build.exe
Size 15KB
Sample240529-jldxaafe2t
SHA256 abe621c37b2e40f6c6b3d9da15e37d4001188e10bac99e5d66c23cee23b98d03
MD5 27275853bd5996fb2f3767772d068d56
SHA1 14fb4c3c74870f14af8c4cd7c8eafa81c99c70c2
SHA512 7e05ec050eaea236c04d74042ac1b2d5634e2be0dd3b8807bada25c38f2f758de9cc25d69fcfd5086b949dc74b97ad2401bce9e6db541153cec60e33024cc887
SSDEEP 384:twpcZrxSdohsUVdko8bxjsCa2txgb6P/sxErmM8/ANWUh:mpSk8VOfb2M669Sct
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 execution spyware stealer trojan

Malware Config

Extracted

Family

quasar

Version

1.4.1

Botnet

Office04

31.177.108.29:4782

Mutex

553dcf2c-4c70-4c0c-935a-2e078a46f03e

Attributes

encryption_key
DAFF70D249B4EC619D5A052FDD3418E3549FF268
install_name
KR6nDu9fLhop1bFe.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Defender.Process
subdirectory
SubDir

Signatures

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

Quasar payload 1 IoCs

resource	yara_rule
behavioral2/memory/3756-30-0x0000000000D60000-0x0000000001084000-memory.dmp	family_quasar

Command and Scripting Interpreter: PowerShell 1 TTPs 2 IoCs

Run Powershell to modify Windows Defender settings to add exclusions for file extensions, paths, and processes.

execution

PowerShell

T1059.001

pid	Process
1992	powershell.exe
4272	powershell.exe

Downloads MZ/PE file

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-1-5-21-3558294865-3673844354-2255444939-1000\Control Panel\International\Geo\Nation	Build.exe

Executes dropped EXE 3 IoCs

pid	Process
3756	iZ5Mr99qorjPtTDp.exe
1696	KR6nDu9fLhop1bFe.exe
3056	olZa1OvV2BoFMUYp.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001
Accesses cryptocurrency files/wallets, possible credential harvesting 2 TTPs
spyware

Data from Local System
T1005

Credentials In Files
T1552.001

Looks up external IP address via web service 2 IoCs

Uses a legitimate IP lookup service to find the infected system's external IP.

flow	ioc
3	api.ipify.org
4	api.ipify.org

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 2 IoCs

Schtasks is often used by malware for persistence or to perform post-infection execution.

persistence

Scheduled Task/Job

T1053

pid	Process
3864	schtasks.exe
3436	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
1992	powershell.exe
1992	powershell.exe
4272	powershell.exe
4272	powershell.exe

Suspicious use of AdjustPrivilegeToken 5 IoCs

description	pid	Process
Token: SeDebugPrivilege	1476	Build.exe
Token: SeDebugPrivilege	1992	powershell.exe
Token: SeDebugPrivilege	3756	iZ5Mr99qorjPtTDp.exe
Token: SeDebugPrivilege	1696	KR6nDu9fLhop1bFe.exe
Token: SeDebugPrivilege	4272	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
1696	KR6nDu9fLhop1bFe.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 1476 wrote to memory of 1992	1476	Build.exe	82
PID 1476 wrote to memory of 1992	1476	Build.exe	82
PID 1476 wrote to memory of 3756	1476	Build.exe	95
PID 1476 wrote to memory of 3756	1476	Build.exe	95
PID 3756 wrote to memory of 3864	3756	iZ5Mr99qorjPtTDp.exe	98
PID 3756 wrote to memory of 3864	3756	iZ5Mr99qorjPtTDp.exe	98
PID 3756 wrote to memory of 1696	3756	iZ5Mr99qorjPtTDp.exe	100
PID 3756 wrote to memory of 1696	3756	iZ5Mr99qorjPtTDp.exe	100
PID 1696 wrote to memory of 3436	1696	KR6nDu9fLhop1bFe.exe	101
PID 1696 wrote to memory of 3436	1696	KR6nDu9fLhop1bFe.exe	101
PID 1476 wrote to memory of 3056	1476	Build.exe	103
PID 1476 wrote to memory of 3056	1476	Build.exe	103
PID 3056 wrote to memory of 4272	3056	olZa1OvV2BoFMUYp.exe	106
PID 3056 wrote to memory of 4272	3056	olZa1OvV2BoFMUYp.exe	106

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\Build.exe
"C:\Users\Admin\AppData\Local\Temp\Build.exe"
1⤵
- Checks computer location settings
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1476
- C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\SubDir'
  2⤵
  - Command and Scripting Interpreter: PowerShell
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:1992
- C:\Users\Admin\AppData\Roaming\SubDir\iZ5Mr99qorjPtTDp.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\iZ5Mr99qorjPtTDp.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:3756
- - C:\Windows\SYSTEM32\schtasks.exe
    "schtasks" /create /tn "Defender.Process" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3864
- - C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe
    "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1696
  - - C:\Windows\SYSTEM32\schtasks.exe
      "schtasks" /create /tn "Defender.Process" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\SubDir\KR6nDu9fLhop1bFe.exe" /rl HIGHEST /f
      4⤵
      Creates scheduled task(s)
      PID:3436
- C:\Users\Admin\AppData\Roaming\SubDir\olZa1OvV2BoFMUYp.exe
  "C:\Users\Admin\AppData\Roaming\SubDir\olZa1OvV2BoFMUYp.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:3056
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" -NoProfile -NonInteractive -NoLogo -Command "[Console]::OutputEncoding = [System.Text.Encoding]::UTF8; Get-Culture | Select -ExpandProperty DisplayName"
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4272

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

PowerShell

T1059.001

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

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Downloads

powershell.exe.log

Path C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log
Size 2KB
SHA256 84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f
MD5 d85ba6ff808d9e5444a4b369f5bc2730
SHA1 31aa9d96590fff6981b315e0b391b575e4c0804a
SHA512 8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249
MD5 SHA1 SHA512

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StartupProfileData-NonInteractive

Path C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive
Size 944B
SHA256 2360634e63e8f0b5748e2c56ebb8f4aa78e71008ea7b5c9ca1c49be03b49557d
MD5 6d3e9c29fe44e90aae6ed30ccf799ca8
SHA1 c7974ef72264bbdf13a2793ccf1aed11bc565dce
SHA512 60c38c4367352537545d859f64b9c5cbada94240478d1d039fd27b5ecba4dc1c90051557c16d802269703b873546ead416279c0a80c6fd5e49ad361cef22596a
MD5 SHA1 SHA512

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__PSScriptPolicyTest_ibhmpc5a.iu2.ps1

Path C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_ibhmpc5a.iu2.ps1
Size 60B
SHA256 96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7
MD5 d17fe0a3f47be24a6453e9ef58c94641
SHA1 6ab83620379fc69f80c0242105ddffd7d98d5d9d
SHA512 5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82
MD5 SHA1 SHA512

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screen1.png

Path C:\Users\Admin\AppData\Local\Temp\iJV9IBydfKeEjlXPz0X27H95jSaSUU\screen1.png
Size 470KB
SHA256 c470b5cea04aa2fd21ac20b69bd3a1a1b2e9b0c5dbd917d4284d0de5a969a0ab
MD5 f7976b5b2e52994dc7f0fd99eb4298c6
SHA1 4ab5ee6da8ea59eb931f088987a3ebb6342b2ade
SHA512 40653a035acf3b01c55cca8263fbf31e41c9bf21fc01f44c21dac6a035c2454e76d34fef93e8cbaf4ab44b62177dd4bcf7c60d45902c497eac677a8a546fcd28
SSDEEP 12288:BrPFboT3o5QZtxEyNi14P85t0xof0Rppbizzo:Bu3S6t3A5H8vJizzo
MD5 SHA1 SHA512 SSDEEP

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sensitive-files.zip

Path C:\Users\Admin\AppData\Local\Temp\iJV9IBydfKeEjlXPz0X27H95jSaSUU\sensitive-files.zip
Size 2.4MB
SHA256 044596fcb58f238d4e88841dabf5b002f9af1dd741ba97279dcd38ab9c335649
MD5 9ba45267a4c8a07069e4624963c87dd8
SHA1 b69fd1f2e72ee319ea7ae9d5179f6df34b2e850b
SHA512 78640398e2d8372ee839bed344152675b29ba94ebccfb0aee91c936818effb90b76f1fa1f43db36b94eb82b0ea0eaeebf61982f857c1ec8bd44985524e128a8d
SSDEEP 49152:OTBUGiN+nP+Yy9sAkupOfJYNA6XhQKqUZTBF3CtQkbhm0Gm9YcDcl:OTBUGiInGYoawUUA6XhQKqUnFAQklDG5
MD5 SHA1 SHA512 SSDEEP

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user_info.txt

Path C:\Users\Admin\AppData\Local\Temp\iJV9IBydfKeEjlXPz0X27H95jSaSUU\user_info.txt
Size 732B
SHA256 1a99d88d9cb2a18805a8bd30cdc1270913574e97dac6d18827a4e5e95240ba3e
MD5 8b145d76613e14a27877b3ecf300c6f9
SHA1 d3cf27ea72c52e3efe55d41638a80be125d70fe7
SHA512 433dade4c80e7c6a52bc49ddc1d1f049ad4b9ba87b0b686a875cf722a427311ae8c24dab658debcd546aa4649ede65bd33dae151833caf561cb3a4c02c2990f8
MD5 SHA1 SHA512

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memory/1476-40-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

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memory/1476-0-0x000001F6B5390000-0x000001F6B539A000-memory.dmp

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memory/1476-1-0x00007FFB43783000-0x00007FFB43785000-memory.dmp

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memory/1476-2-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

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memory/1476-50-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

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memory/1476-39-0x00007FFB43783000-0x00007FFB43785000-memory.dmp

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memory/1696-38-0x000000001BC60000-0x000000001BD12000-memory.dmp

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memory/1696-37-0x0000000002C20000-0x0000000002C70000-memory.dmp

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memory/1992-8-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

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memory/1992-18-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

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memory/1992-15-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

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memory/1992-14-0x00007FFB43780000-0x00007FFB44241000-memory.dmp

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memory/1992-9-0x000001D35A0B0000-0x000001D35A0D2000-memory.dmp

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memory/3756-30-0x0000000000D60000-0x0000000001084000-memory.dmp

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