quasar | fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314

General

Target

2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe
Size

757KB
MD5

2957c39376a38df6aefaee72674c92af
SHA1

f32007bbb1c99bda6e4c97b4a695e87913fd87b1
SHA256

fbc4fd5e3d3f2b5ccd26807e9e73498b3a3699e7efe35c624fbebcdc2c0c6314
SHA512

8cecae621972be05ab9be0071689fcf29028f63b1519c4698d531bc754af7363f7bc21dbfb1d97e75914d884ecf4e1264ff20b2903f7b11c45dc88a77ec5dcbc
SSDEEP

12288:cgvSXyMjLJFlHSXDe/XDsKI+6lHE50yzXcpimSZRtvifjP8HQQaf8+TX:cTJmXyzsKOlHEOyzXcpRSZRNIjPrF

Score

10^/10

quasar venomrat office04 persistence rat rootkit spyware stealer trojan

Malware Config

Extracted

Family

quasar

Attributes

reconnect_delay
3000

Extracted

Family

quasar

Version

2.1.0.0

Botnet

Office04

C2

myconect.ddns.net:6606

Mutex

VNM_MUTEX_bW2Pm17MwUNvIYeCrf

Attributes

encryption_key
skMcIyTXgvAaYya6lzLD
install_name
Client.exe
log_directory
Logs
reconnect_delay
3000
startup_key
Venom Client Startup
subdirectory
SubDir

Signatures

Contains code to disable Windows Defender 3 IoCs

A .NET executable tasked with disabling Windows Defender capabilities such as realtime monitoring, blocking at first seen, etc.

Processes:

resource	yara_rule
behavioral2/memory/2912-14-0x0000000000400000-0x000000000048E000-memory.dmp	disable_win_def
C:\Windows\Temp\x4p2xkdk.exe	disable_win_def
behavioral2/memory/404-45-0x00000000001B0000-0x000000000023C000-memory.dmp	disable_win_def

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

Quasar payload 3 IoCs

Processes:

resource	yara_rule
behavioral2/memory/2912-14-0x0000000000400000-0x000000000048E000-memory.dmp	family_quasar
C:\Windows\Temp\x4p2xkdk.exe	family_quasar
behavioral2/memory/404-45-0x00000000001B0000-0x000000000023C000-memory.dmp	family_quasar

VenomRAT
VenomRAT is a modified version of QuasarRAT with some added features, such as rootkit and stealer capabilites.
rat rootkit stealer venomrat
Executes dropped EXE 1 IoCs

Processes:

x4p2xkdk.exe

pid process

404 x4p2xkdk.exe

pid	process
404	x4p2xkdk.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

Processes:

powershell.exe

description	ioc	process
Set value (str)	\REGISTRY\USER\S-1-5-21-1181767204-2009306918-3718769404-1000\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\lxxgldt snybyasm = "C:\\Users\\Admin\\AppData\\Roaming\\fdfhhuxv ssqavqkxj\\chome_exe.exe"	powershell.exe

Looks up external IP address via web service 1 IoCs
Uses a legitimate IP lookup service to find the infected system's external IP.

Processes:

flow ioc

9 ip-api.com
Suspicious use of SetThreadContext 1 IoCs

Processes:

2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe

description pid process target process

PID 1920 set thread context of 2912 1920 2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe RegAsm.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082
Kills process with taskkill 1 IoCs
evasion

Processes:

taskkill.exe

pid process

4640 taskkill.exe

flow	ioc
9	ip-api.com

description	pid	process	target process
PID 1920 set thread context of 2912	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe

pid	process
4640	taskkill.exe

Suspicious behavior: EnumeratesProcesses 64 IoCs

Processes:

2957c39376a38df6aefaee72674c92af_JaffaCakes118.exeRegAsm.exe

pid	process
1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe
1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe
2912	RegAsm.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

Processes:

2957c39376a38df6aefaee72674c92af_JaffaCakes118.exeRegAsm.exepowershell.exetaskkill.exex4p2xkdk.exe

description	pid	process
Token: SeDebugPrivilege	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe
Token: SeDebugPrivilege	2912	RegAsm.exe
Token: SeDebugPrivilege	1976	powershell.exe
Token: SeDebugPrivilege	4640	taskkill.exe
Token: SeDebugPrivilege	404	x4p2xkdk.exe
Token: SeDebugPrivilege	404	x4p2xkdk.exe

Suspicious use of SetWindowsHookEx 2 IoCs

Processes:

RegAsm.exe

pid process

2912 RegAsm.exe
2912 RegAsm.exe

pid	process
2912	RegAsm.exe
2912	RegAsm.exe

Suspicious use of WriteProcessMemory 26 IoCs

Processes:

2957c39376a38df6aefaee72674c92af_JaffaCakes118.exeRegAsm.exeDllHost.execmd.exe

description	pid	process	target process
PID 1920 wrote to memory of 1976	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	powershell.exe
PID 1920 wrote to memory of 1976	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	powershell.exe
PID 1920 wrote to memory of 1976	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	powershell.exe
PID 1920 wrote to memory of 4156	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 1920 wrote to memory of 4156	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 1920 wrote to memory of 4156	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 1920 wrote to memory of 2912	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 1920 wrote to memory of 2912	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 1920 wrote to memory of 2912	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 1920 wrote to memory of 2912	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 1920 wrote to memory of 2912	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 1920 wrote to memory of 2912	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 1920 wrote to memory of 2912	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 1920 wrote to memory of 2912	1920	2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe	RegAsm.exe
PID 2912 wrote to memory of 1952	2912	RegAsm.exe	cmstp.exe
PID 2912 wrote to memory of 1952	2912	RegAsm.exe	cmstp.exe
PID 2912 wrote to memory of 1952	2912	RegAsm.exe	cmstp.exe
PID 4960 wrote to memory of 1648	4960	DllHost.exe	cmd.exe
PID 4960 wrote to memory of 1648	4960	DllHost.exe	cmd.exe
PID 4960 wrote to memory of 1648	4960	DllHost.exe	cmd.exe
PID 1648 wrote to memory of 404	1648	cmd.exe	x4p2xkdk.exe
PID 1648 wrote to memory of 404	1648	cmd.exe	x4p2xkdk.exe
PID 1648 wrote to memory of 404	1648	cmd.exe	x4p2xkdk.exe
PID 4960 wrote to memory of 4640	4960	DllHost.exe	taskkill.exe
PID 4960 wrote to memory of 4640	4960	DllHost.exe	taskkill.exe
PID 4960 wrote to memory of 4640	4960	DllHost.exe	taskkill.exe

C:\Users\Admin\AppData\Local\Temp\2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe
"C:\Users\Admin\AppData\Local\Temp\2957c39376a38df6aefaee72674c92af_JaffaCakes118.exe"
1⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1920
- C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
  "powershell.exe" Remove-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'lxxgldt snybyasm';New-ItemProperty -Path 'HKCU:\SOFTWARE\Microsoft\Windows\CurrentVersion\Run' -Name 'lxxgldt snybyasm' -Value '"C:\Users\Admin\AppData\Roaming\fdfhhuxv ssqavqkxj\chome_exe.exe"' -PropertyType 'String'
  2⤵
  - Adds Run key to start application
  - Suspicious use of AdjustPrivilegeToken
  PID:1976
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  PID:4156
- C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe
  "C:\Windows\Microsoft.NET\Framework\v4.0.30319\RegAsm.exe"
  2⤵
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:2912
- - \??\c:\windows\SysWOW64\cmstp.exe
    "c:\windows\system32\cmstp.exe" /au C:\Windows\temp\p0iaf0wn.inf
    3⤵
    PID:1952

C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe
"C:\Program Files (x86)\Microsoft\Edge\Application\msedge.exe" --type=utility --utility-sub-type=asset_store.mojom.AssetStoreService --lang=en-US --service-sandbox-type=asset_store_service --no-appcompat-clear --field-trial-handle=1036,i,6576818814118437872,11004518367271063231,262144 --variations-seed-version --mojo-platform-channel-handle=3944 /prefetch:8
1⤵
PID:2352

C:\Windows\SysWOW64\DllHost.exe
C:\Windows\SysWOW64\DllHost.exe /Processid:{3E5FC7F9-9A51-4367-9063-A120244FBEC7}
1⤵
- Suspicious use of WriteProcessMemory
PID:4960
- C:\Windows\SysWOW64\cmd.exe
  cmd /c start C:\Windows\temp\x4p2xkdk.exe
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1648
- - C:\Windows\temp\x4p2xkdk.exe
    C:\Windows\temp\x4p2xkdk.exe
    3⤵
    - Executes dropped EXE
    - Suspicious use of AdjustPrivilegeToken
    PID:404
- C:\Windows\SysWOW64\taskkill.exe
  taskkill /IM cmstp.exe /F
  2⤵
  - Kills process with taskkill
  - Suspicious use of AdjustPrivilegeToken
  PID:4640

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

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vkdxzta5.a5c.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Windows\Temp\x4p2xkdk.exe

Filesize
534KB

MD5
e4dc9cb250120aebeee969906d1a7a22

SHA1
c0f9d3a2531cc25e212d9adbf8614903d8a6247e

SHA256
14de179b37e9958b3a1d22f22b0bb545be1cb166aeaf5a4892ccd616ee7e544f

SHA512
21461e4fdc16ba99ae24a1f2fa39465678e851591d7402c762a04bf286b9ec8230a0acd147f0c9d54fb6a3428be1851c4d75f46b6cf917a44b3b399e8897667b

Download Submit
C:\Windows\temp\p0iaf0wn.inf

Filesize
606B

MD5
05a07cb438ef32b83b7b9e6613be1156

SHA1
e25fc41221e411e24dbf2a8bcd1b098c6602cf14

SHA256
ba01b544995186e3c72ee61d12099ba5c4f6049a91bde0b75745b004dcc96512

SHA512
3a166662f7f076333a88511d425416e217800f2e35c3947f31e1b8d271a1a11ff4093d5ef922a0b3f5dceebce27e27e46f5d8a9bed30849140d2e46a3b9382bd

Download Submit
memory/404-52-0x0000000005EB0000-0x0000000005EEC000-memory.dmp

Filesize
240KB

Download
memory/404-49-0x0000000005970000-0x0000000005982000-memory.dmp

Filesize
72KB

Download
memory/404-45-0x00000000001B0000-0x000000000023C000-memory.dmp

Filesize
560KB

Download
memory/1920-23-0x0000000074AD0000-0x0000000075280000-memory.dmp

Filesize
7.7MB

Download
memory/1920-6-0x0000000004C60000-0x0000000004C6A000-memory.dmp

Filesize
40KB

Download
memory/1920-8-0x0000000074ADE000-0x0000000074ADF000-memory.dmp

Filesize
4KB

Download
memory/1920-9-0x0000000074AD0000-0x0000000075280000-memory.dmp

Filesize
7.7MB

Download
memory/1920-10-0x0000000005050000-0x00000000050E0000-memory.dmp

Filesize
576KB

Download
memory/1920-11-0x0000000004DA0000-0x0000000004DBE000-memory.dmp

Filesize
120KB

Download
memory/1920-1-0x00000000000A0000-0x0000000000164000-memory.dmp

Filesize
784KB

Download
memory/1920-2-0x0000000074AD0000-0x0000000075280000-memory.dmp

Filesize
7.7MB

Download
memory/1920-3-0x0000000004B00000-0x0000000004B92000-memory.dmp

Filesize
584KB

Download
memory/1920-4-0x0000000005140000-0x00000000056E4000-memory.dmp

Filesize
5.6MB

Download
memory/1920-5-0x0000000004C70000-0x0000000004D02000-memory.dmp

Filesize
584KB

Download
memory/1920-7-0x0000000004ED0000-0x0000000004F46000-memory.dmp

Filesize
472KB

Download
memory/1920-0-0x0000000074ADE000-0x0000000074ADF000-memory.dmp

Filesize
4KB

Download
memory/1976-31-0x0000000005850000-0x00000000058B6000-memory.dmp

Filesize
408KB

Download
memory/1976-47-0x0000000006BE0000-0x0000000006BFA000-memory.dmp

Filesize
104KB

Download
memory/1976-13-0x0000000005110000-0x0000000005146000-memory.dmp

Filesize
216KB

Download
memory/1976-32-0x0000000005FB0000-0x0000000006016000-memory.dmp

Filesize
408KB

Download
memory/1976-30-0x0000000005730000-0x0000000005752000-memory.dmp

Filesize
136KB

Download
memory/1976-37-0x0000000006120000-0x0000000006474000-memory.dmp

Filesize
3.3MB

Download
memory/1976-20-0x0000000074AD0000-0x0000000075280000-memory.dmp

Filesize
7.7MB

Download
memory/1976-38-0x00000000066E0000-0x00000000066FE000-memory.dmp

Filesize
120KB

Download
memory/1976-39-0x0000000006700000-0x000000000674C000-memory.dmp

Filesize
304KB

Download
memory/1976-51-0x0000000074AD0000-0x0000000075280000-memory.dmp

Filesize
7.7MB

Download
memory/1976-17-0x00000000058D0000-0x0000000005EF8000-memory.dmp

Filesize
6.2MB

Download
memory/1976-16-0x0000000074AD0000-0x0000000075280000-memory.dmp

Filesize
7.7MB

Download
memory/1976-48-0x0000000006C30000-0x0000000006C52000-memory.dmp

Filesize
136KB

Download
memory/1976-46-0x0000000007690000-0x0000000007726000-memory.dmp

Filesize
600KB

Download
memory/2912-24-0x0000000074AD0000-0x0000000075280000-memory.dmp

Filesize
7.7MB

Download
memory/2912-14-0x0000000000400000-0x000000000048E000-memory.dmp

Filesize
568KB

Download
memory/2912-41-0x0000000074AD0000-0x0000000075280000-memory.dmp

Filesize
7.7MB

Download
memory/2912-22-0x0000000074AD0000-0x0000000075280000-memory.dmp

Filesize
7.7MB

Download

Analysis

Sharing

General

Malware Config

Extracted

Extracted

Signatures

Processes

Network

MITRE ATT&CK Enterprise v15

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Downloads