quasar | 8904d96a473dd52cd5255e046d47148eb27cc778395fff4f220bbb9509f643d8

Analysis

max time kernel
364s
max time network
364s
platform
windows7_x64
resource
win7-20240221-en
resource tags

arch:x64arch:x86image:win7-20240221-enlocale:en-usos:windows7-x64system
submitted
28/04/2024, 00:05

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General

Target
IDTOIPBYR_0.exe
Size 413KB
Sample240428-ac5tzabe55
SHA256 4466cd4392c0fa3c49979664630db1b607e129c858fd44507cf5fc6b5b9dd3ba
MD5 aabcedbac7ad8b10993f6de878be1ba4
SHA1 be8ea58edc1e83ebf33fe0e87a29916e9c554426
SHA512 5a2bb094997699335a149ca353dc5e98e66482aa9dadc52502068337760bbd65bd648b3935777f4424e9811705657bcd2eb38254d731d892256d578c1f1eaf66
SSDEEP 6144:2gmEjkzQT1TVNSeE7E11zVeusnib8YoVHR8z0n7kgpMRqZGe:T1TVVXEo13eusHnVH9pMRWGe
MD5 SHA1 SHA512 SSDEEP

Score

10^/10

quasar office04 spyware trojan

Malware Config

Extracted

Family

quasar

Version

3.1.5

Botnet

Office04

147.185.221.19:33587

Mutex

$Sxr-lG7PreqFKmNhJc0CKS

Attributes

encryption_key
11fnZjAdVB1EIQVhl7wn
install_name
DLLrunhost.exe
log_directory
UpdLogs
reconnect_delay
3000
startup_key
WindowsAudioHelper
subdirectory
Windows

Signatures

Quasar RAT 3 IoCs

Quasar is an open source Remote Access Tool.

trojan spyware quasar

flow	ioc	pid	Process
2	ip-api.com		Process not Found
4	ip-api.com		Process not Found
		2688	schtasks.exe

Quasar payload 3 IoCs

resource	yara_rule
behavioral9/memory/2288-0-0x0000000000D10000-0x0000000000D7E000-memory.dmp	family_quasar
behavioral9/files/0x0032000000014e5a-4.dat	family_quasar
behavioral9/memory/2540-10-0x0000000000AC0000-0x0000000000B2E000-memory.dmp	family_quasar

Drops file in Drivers directory 2 IoCs

description	ioc	Process
File opened for modification	C:\Windows\system32\drivers\etc\hosts	DLLrunhost.exe
File opened for modification	C:\Windows\system32\drivers\etc\hosts	IDTOIPBYR_0.exe

Executes dropped EXE 1 IoCs

pid	Process
2540	DLLrunhost.exe

Loads dropped DLL 1 IoCs

pid	Process
2288	IDTOIPBYR_0.exe

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
4	ip-api.com
2	ip-api.com

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 4 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
2688	schtasks.exe
2408	SCHTASKS.exe
2620	schtasks.exe
1564	SCHTASKS.exe

Gathers network information 2 TTPs 2 IoCs

Uses commandline utility to view network configuration.

System Information Discovery

T1082

Command and Scripting Interpreter

T1059

pid	Process
2420	ipconfig.exe
2444	ipconfig.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
1520	PING.EXE

Suspicious behavior: EnumeratesProcesses 2 IoCs

pid	Process
2692	powershell.exe
1616	powershell.exe

Suspicious use of AdjustPrivilegeToken 4 IoCs

description	pid	Process
Token: SeDebugPrivilege	2288	IDTOIPBYR_0.exe
Token: SeDebugPrivilege	2692	powershell.exe
Token: SeDebugPrivilege	2540	DLLrunhost.exe
Token: SeDebugPrivilege	1616	powershell.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
2540	DLLrunhost.exe

Suspicious use of WriteProcessMemory 55 IoCs

description	pid	Process	procid_target
PID 2288 wrote to memory of 2688	2288	IDTOIPBYR_0.exe	29
PID 2288 wrote to memory of 2688	2288	IDTOIPBYR_0.exe	29
PID 2288 wrote to memory of 2688	2288	IDTOIPBYR_0.exe	29
PID 2288 wrote to memory of 2688	2288	IDTOIPBYR_0.exe	29
PID 2288 wrote to memory of 2540	2288	IDTOIPBYR_0.exe	31
PID 2288 wrote to memory of 2540	2288	IDTOIPBYR_0.exe	31
PID 2288 wrote to memory of 2540	2288	IDTOIPBYR_0.exe	31
PID 2288 wrote to memory of 2540	2288	IDTOIPBYR_0.exe	31
PID 2288 wrote to memory of 2540	2288	IDTOIPBYR_0.exe	31
PID 2288 wrote to memory of 2540	2288	IDTOIPBYR_0.exe	31
PID 2288 wrote to memory of 2540	2288	IDTOIPBYR_0.exe	31
PID 2288 wrote to memory of 2692	2288	IDTOIPBYR_0.exe	32
PID 2288 wrote to memory of 2692	2288	IDTOIPBYR_0.exe	32
PID 2288 wrote to memory of 2692	2288	IDTOIPBYR_0.exe	32
PID 2288 wrote to memory of 2692	2288	IDTOIPBYR_0.exe	32
PID 2288 wrote to memory of 2420	2288	IDTOIPBYR_0.exe	34
PID 2288 wrote to memory of 2420	2288	IDTOIPBYR_0.exe	34
PID 2288 wrote to memory of 2420	2288	IDTOIPBYR_0.exe	34
PID 2288 wrote to memory of 2420	2288	IDTOIPBYR_0.exe	34
PID 2288 wrote to memory of 2408	2288	IDTOIPBYR_0.exe	36
PID 2288 wrote to memory of 2408	2288	IDTOIPBYR_0.exe	36
PID 2288 wrote to memory of 2408	2288	IDTOIPBYR_0.exe	36
PID 2288 wrote to memory of 2408	2288	IDTOIPBYR_0.exe	36
PID 2540 wrote to memory of 2620	2540	DLLrunhost.exe	38
PID 2540 wrote to memory of 2620	2540	DLLrunhost.exe	38
PID 2540 wrote to memory of 2620	2540	DLLrunhost.exe	38
PID 2540 wrote to memory of 2620	2540	DLLrunhost.exe	38
PID 2540 wrote to memory of 2852	2540	DLLrunhost.exe	43
PID 2540 wrote to memory of 2852	2540	DLLrunhost.exe	43
PID 2540 wrote to memory of 2852	2540	DLLrunhost.exe	43
PID 2540 wrote to memory of 2852	2540	DLLrunhost.exe	43
PID 2540 wrote to memory of 2896	2540	DLLrunhost.exe	45
PID 2540 wrote to memory of 2896	2540	DLLrunhost.exe	45
PID 2540 wrote to memory of 2896	2540	DLLrunhost.exe	45
PID 2540 wrote to memory of 2896	2540	DLLrunhost.exe	45
PID 2896 wrote to memory of 272	2896	cmd.exe	47
PID 2896 wrote to memory of 272	2896	cmd.exe	47
PID 2896 wrote to memory of 272	2896	cmd.exe	47
PID 2896 wrote to memory of 272	2896	cmd.exe	47
PID 2896 wrote to memory of 1520	2896	cmd.exe	48
PID 2896 wrote to memory of 1520	2896	cmd.exe	48
PID 2896 wrote to memory of 1520	2896	cmd.exe	48
PID 2896 wrote to memory of 1520	2896	cmd.exe	48
PID 2540 wrote to memory of 1616	2540	DLLrunhost.exe	49
PID 2540 wrote to memory of 1616	2540	DLLrunhost.exe	49
PID 2540 wrote to memory of 1616	2540	DLLrunhost.exe	49
PID 2540 wrote to memory of 1616	2540	DLLrunhost.exe	49
PID 2540 wrote to memory of 2444	2540	DLLrunhost.exe	51
PID 2540 wrote to memory of 2444	2540	DLLrunhost.exe	51
PID 2540 wrote to memory of 2444	2540	DLLrunhost.exe	51
PID 2540 wrote to memory of 2444	2540	DLLrunhost.exe	51
PID 2540 wrote to memory of 1564	2540	DLLrunhost.exe	53
PID 2540 wrote to memory of 1564	2540	DLLrunhost.exe	53
PID 2540 wrote to memory of 1564	2540	DLLrunhost.exe	53
PID 2540 wrote to memory of 1564	2540	DLLrunhost.exe	53

C:\Users\Admin\AppData\Local\Temp\IDTOIPBYR_0.exe
"C:\Users\Admin\AppData\Local\Temp\IDTOIPBYR_0.exe"
1⤵
- Drops file in Drivers directory
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:2288
- C:\Windows\SysWOW64\schtasks.exe
  "schtasks" /create /tn "WindowsAudioHelper" /sc ONLOGON /tr "C:\Users\Admin\AppData\Local\Temp\IDTOIPBYR_0.exe" /rl HIGHEST /f
  2⤵
  - Quasar RAT
  - Creates scheduled task(s)
  PID:2688
- C:\Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe
  "C:\Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe"
  2⤵
  - Drops file in Drivers directory
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2540
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /create /tn "WindowsAudioHelper" /sc ONLOGON /tr "C:\Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:2620
- - C:\Windows\SysWOW64\schtasks.exe
    "schtasks" /delete /tn "WindowsAudioHelper" /f
    3⤵
    PID:2852
- - C:\Windows\SysWOW64\cmd.exe
    cmd /c ""C:\Users\Admin\AppData\Local\Temp\IjzI7sCl8fnQ.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:2896
  - - C:\Windows\SysWOW64\chcp.com
      chcp 65001
      4⤵
      PID:272
  - - C:\Windows\SysWOW64\PING.EXE
      ping -n 10 localhost
      4⤵
      Runs ping.exe
      PID:1520
- - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
    "powershell.exe" -WindowStyle Hidden -Command "Add-MpPreference -ExclusionPath (Get-Item -LiteralPath $env:SystemRoot).Root"
    3⤵
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1616
- - C:\Windows\SysWOW64\ipconfig.exe
    "C:\Windows\System32\ipconfig.exe" /flushdns
    3⤵
    - Gathers network information
    PID:2444
- - C:\Windows\SysWOW64\SCHTASKS.exe
    "SCHTASKS.exe" /create /tn "$77DLLrunhost.exe" /tr "'C:\Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe'" /sc onlogon /rl HIGHEST
    3⤵
    - Creates scheduled task(s)
    PID:1564
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" -WindowStyle Hidden -Command "Add-MpPreference -ExclusionPath (Get-Item -LiteralPath $env:SystemRoot).Root"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  PID:2692
- C:\Windows\SysWOW64\ipconfig.exe
  "C:\Windows\System32\ipconfig.exe" /flushdns
  2⤵
  - Gathers network information
  PID:2420
- C:\Windows\SysWOW64\SCHTASKS.exe
  "SCHTASKS.exe" /create /tn "$77IDTOIPBYR_0.exe" /tr "'C:\Users\Admin\AppData\Local\Temp\IDTOIPBYR_0.exe'" /sc onlogon /rl HIGHEST
  2⤵
  - Creates scheduled task(s)
  PID:2408

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

T1059

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Discovery

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

IjzI7sCl8fnQ.bat

Path C:\Users\Admin\AppData\Local\Temp\IjzI7sCl8fnQ.bat
Size 270B
SHA256 515180f3505670007fa1f5042854ee1fd3222a7f84c009a9349f270e01a7ce46
MD5 de940645b20fdd1dea1acafd00f60e33
SHA1 21146900e934e5d5098e7aa3078b504bd423936c
SHA512 bd0ad3929e78663f976c57dc70837f09f3326fe5926637c8f67be808a492f26bbf1bdab781d6a7ab4a163f57386aec7f03056292cf2dd2f624ea83005f2add7c
MD5 SHA1 SHA512

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7VKXPKJV8EHJGAJRSOB6.temp

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\7VKXPKJV8EHJGAJRSOB6.temp
Size 7KB
SHA256 1139dd077f08ad6fafcae04e03ab89f96f4e2c95019d9ddc7002c230baaa2fb8
MD5 d3c6fc5b5f146dbead5199f6a5f2e7e3
SHA1 7e8b79d67e591d1f6ed4d8c9f7b63e8ec21e642c
SHA512 2348bb7052b986c0008ade3ed1f45b43b9f7e35010f167f9e9b28de20e8a64cd762ef59c004f55813ccc82dacc0566bff4d4a8550a501426cc3cef43c9589a61
SSDEEP 96:YAqqCZM8snqvsqvJCwoBAqqCZM8snqvsEHyqvJCworPJUUQHuZ7qOXlUVs:obAUofbAAHnorPtjZ7qOr
MD5 SHA1 SHA512 SSDEEP

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d93f411851d7c929.customDestinations-ms

Path C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\d93f411851d7c929.customDestinations-ms
Size 7KB
SHA256 061fd74a7147a449de0684c71412cac64feee020fd8028022f87f9bfc6a56d10
MD5 c25dcd527c2c1b0cc9b747ef6f5f6ada
SHA1 ba622c5e485b4959bd7bb5d554358dd6c4bdc175
SHA512 d4e9fcb8c6bfcb62f4de6ff7d5e22e5b4c89e678958c150f79fd5174139d47555c6e4a2a09183959079facec9d3542c07b60223b3f5abd2817959f60f0400487
SSDEEP 96:YAqqCZM8snqvsqvJCwoBAqqCZM8snqvsEHyqvJCworPtUUQHuZ7qOXlUVs:obAUofbAAHnorPxjZ7qOr
MD5 SHA1 SHA512 SSDEEP

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04-28-~1

Path C:\Users\Admin\AppData\Roaming\UpdLogs\04-28-~1
Size 224B
SHA256 7087c87e038ba9f81121e0a91f3e05e6aa108aaee7d947854e03e35a7c29bd28
MD5 751240313794c07790c6a4c80965c724
SHA1 aa47561cf7fb31c3949615801d627caf08b7501c
SHA512 4ff31ca299ea08bc96e8614a0db92d5cfff6c7f78ec41c04e912f4c6cadccc23e49a89167b4dad0693c61b4dcdd9cd60d2bdfa490e717836331a3933fed5db8f
MD5 SHA1 SHA512

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hosts

Path C:\Windows\system32\drivers\etc\hosts
Size 4KB
SHA256 c7bb8931dd150e1251de035823b6c9ddfa84f92b868785717da62163733ff8f4
MD5 7336f9570f191c5259888d4e0c40304c
SHA1 b5993611376d6636db24e9583c16111bdfa3eb3e
SHA512 f7ebc208d01021c4e95a619f22fdae9890cba37fabef4faf9bb5bde9816600e6bfcd7e5203043bb59e86549211ba055ae59b232c04c6376029a501f684195921
SSDEEP 96:vDZEurK9SBiinxJdYd9ldO0f1bnYinxJdYd9ldO0f1bnM:RrK9SBiOYdhO0fyOYdhO0fi
MD5 SHA1 SHA512 SSDEEP

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DLLrunhost.exe

Path \Users\Admin\AppData\Roaming\Windows\DLLrunhost.exe
Size 413KB
SHA256 4466cd4392c0fa3c49979664630db1b607e129c858fd44507cf5fc6b5b9dd3ba
MD5 aabcedbac7ad8b10993f6de878be1ba4
SHA1 be8ea58edc1e83ebf33fe0e87a29916e9c554426
SHA512 5a2bb094997699335a149ca353dc5e98e66482aa9dadc52502068337760bbd65bd648b3935777f4424e9811705657bcd2eb38254d731d892256d578c1f1eaf66
SSDEEP 6144:2gmEjkzQT1TVNSeE7E11zVeusnib8YoVHR8z0n7kgpMRqZGe:T1TVVXEo13eusHnVH9pMRWGe
MD5 SHA1 SHA512 SSDEEP

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memory/2288-1-0x0000000074430000-0x0000000074B1E000-memory.dmp

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memory/2288-2-0x0000000004D60000-0x0000000004DA0000-memory.dmp

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memory/2288-0-0x0000000000D10000-0x0000000000D7E000-memory.dmp

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memory/2288-13-0x0000000074430000-0x0000000074B1E000-memory.dmp

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memory/2540-10-0x0000000000AC0000-0x0000000000B2E000-memory.dmp

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memory/2540-18-0x0000000004880000-0x00000000048C0000-memory.dmp

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memory/2540-17-0x0000000074430000-0x0000000074B1E000-memory.dmp

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memory/2540-11-0x0000000074430000-0x0000000074B1E000-memory.dmp

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memory/2540-35-0x0000000074430000-0x0000000074B1E000-memory.dmp

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memory/2540-12-0x0000000004880000-0x00000000048C0000-memory.dmp

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