xworm | b13fcfd29bfe8e7a729b9261e7df409997069b83cf2ebac629ceb099759e1a29

General

Target

99zRat-cleaned.exe
Size

189KB
MD5

742573ed7b27bbeed5ab6126317581c1
SHA1

09f8c8afcf08bc91a0cfefa7602338d1164e6df8
SHA256

b13fcfd29bfe8e7a729b9261e7df409997069b83cf2ebac629ceb099759e1a29
SHA512

f036b60080ccc9a503c6adb05f8ab007a52e1c16cdda55c4ae9c725d38fc007c3885ee87c165be57e08ea7384935e1af033a3ff13af347ce7eeec0ae1373be06
SSDEEP

3072:Uh9z8AlC630+t5+Fiowk18cyf8sX+Qc/cJ6HM2v0hHsxs:UhpnCOsX83f8Sbc/lT

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

C2

193.161.193.99:63603

37.4.250.236:63603

Attributes

Install_directory
%AppData%
install_file
XwormV6.exe

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x000c000000023b31-6.dat	family_xworm
behavioral2/memory/668-16-0x0000000000470000-0x0000000000486000-memory.dmp	family_xworm

Xworm
Xworm is a remote access trojan written in C#.
trojan rat xworm
Xworm family
xworm

Command and Scripting Interpreter: PowerShell 1 TTPs 4 IoCs

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

execution

PowerShell

T1059.001

pid	Process
4140	powershell.exe
3984	powershell.exe
4508	powershell.exe
4592	powershell.exe

Checks computer location settings 2 TTPs 2 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-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	vchostruntime.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000\Control Panel\International\Geo\Nation	99zRat-cleaned.exe

Drops startup file 2 IoCs

description	ioc	Process
File created	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XwormV6.lnk	vchostruntime.exe
File opened for modification	C:\Users\Admin\AppData\Roaming\Microsoft\Windows\Start Menu\Programs\Startup\XwormV6.lnk	vchostruntime.exe

Executes dropped EXE 1 IoCs

pid	Process
668	vchostruntime.exe

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

System Information Discovery
T1082

Modifies registry class 1 IoCs

description	ioc	Process
Key created	\REGISTRY\USER\S-1-5-21-2437139445-1151884604-3026847218-1000_Classes\Local Settings	99zRat-cleaned.exe

Suspicious behavior: EnumeratesProcesses 8 IoCs

pid	Process
4140	powershell.exe
4140	powershell.exe
3984	powershell.exe
3984	powershell.exe
4508	powershell.exe
4508	powershell.exe
4592	powershell.exe
4592	powershell.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	668	vchostruntime.exe
Token: SeDebugPrivilege	4140	powershell.exe
Token: SeDebugPrivilege	3984	powershell.exe
Token: SeDebugPrivilege	4508	powershell.exe
Token: SeDebugPrivilege	4592	powershell.exe
Token: SeDebugPrivilege	668	vchostruntime.exe

Suspicious use of WriteProcessMemory 12 IoCs

description	pid	Process	procid_target
PID 1856 wrote to memory of 668	1856	99zRat-cleaned.exe	83
PID 1856 wrote to memory of 668	1856	99zRat-cleaned.exe	83
PID 1856 wrote to memory of 2692	1856	99zRat-cleaned.exe	84
PID 1856 wrote to memory of 2692	1856	99zRat-cleaned.exe	84
PID 668 wrote to memory of 4140	668	vchostruntime.exe	91
PID 668 wrote to memory of 4140	668	vchostruntime.exe	91
PID 668 wrote to memory of 3984	668	vchostruntime.exe	93
PID 668 wrote to memory of 3984	668	vchostruntime.exe	93
PID 668 wrote to memory of 4508	668	vchostruntime.exe	97
PID 668 wrote to memory of 4508	668	vchostruntime.exe	97
PID 668 wrote to memory of 4592	668	vchostruntime.exe	99
PID 668 wrote to memory of 4592	668	vchostruntime.exe	99

C:\Users\Admin\AppData\Local\Temp\99zRat-cleaned.exe
"C:\Users\Admin\AppData\Local\Temp\99zRat-cleaned.exe"
1⤵
- Checks computer location settings
- Modifies registry class
- Suspicious use of WriteProcessMemory
PID:1856
- C:\Users\Admin\AppData\Roaming\vchostruntime.exe
  "C:\Users\Admin\AppData\Roaming\vchostruntime.exe"
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of WriteProcessMemory
  PID:668
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\vchostruntime.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4140
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'vchostruntime.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:3984
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\AppData\Roaming\XwormV6.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4508
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XwormV6.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4592
- C:\Windows\System32\WScript.exe
  "C:\Windows\System32\WScript.exe" "C:\Users\Admin\AppData\Roaming\Malera.vbs"
  2⤵
  PID:2692

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Command and Scripting Interpreter

1

T1059

PowerShell

1

T1059.001

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Discovery

Query Registry

1

T1012

System Information Discovery

2

T1082

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

Replay Monitor

Loading Replay Monitor...

Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
d85ba6ff808d9e5444a4b369f5bc2730

SHA1
31aa9d96590fff6981b315e0b391b575e4c0804a

SHA256
84739c608a73509419748e4e20e6cc4e1846056c3fe1929a8300d5a1a488202f

SHA512
8c414eb55b45212af385accc16d9d562adba2123583ce70d22b91161fe878683845512a78f04dedd4ea98ed9b174dbfa98cf696370598ad8e6fbd1e714f1f249

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
77d622bb1a5b250869a3238b9bc1402b

SHA1
d47f4003c2554b9dfc4c16f22460b331886b191b

SHA256
f97ff12a8abf4bf88bb6497bd2ac2da12628c8847a8ba5a9026bdbb76507cdfb

SHA512
d6789b5499f23c9035375a102271e17a8a82e57d6f5312fa24242e08a83efdeb8becb7622f55c4cf1b89c7d864b445df11f4d994cf7e2f87a900535bcca12fd9

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
eb1ad317bd25b55b2bbdce8a28a74a94

SHA1
98a3978be4d10d62e7411946474579ee5bdc5ea6

SHA256
9e94e7c9ac6134ee30e79498558aa1a5a1ac79a643666c3f8922eed215dd3a98

SHA512
d011f266c0240d84470c0f9577cd9e4927309bd19bb38570ca9704ed8e1d159f9bea982a59d3eefef72ce7a10bd81208b82e88ef57c7af587f7437a89769adc0

Download Submit
C:\Users\Admin\AppData\Local\Microsoft\Windows\PowerShell\StartupProfileData-NonInteractive

Filesize
944B

MD5
da5c82b0e070047f7377042d08093ff4

SHA1
89d05987cd60828cca516c5c40c18935c35e8bd3

SHA256
77a94ef8c4258445d538a6006ffadb05afdf888f6f044e1e5466b981a07f16c5

SHA512
7360311a3c97b73dd3f6d7179cd979e0e20d69f380d38292447e17e369087d9dd5acb66cd0cbdd95ac4bfb16e5a1b86825f835a8d45b14ea9812102cff59704b

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_lfaztrqm.r4o.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Roaming\Malera.vbs

Filesize
43B

MD5
deb278e2e3b0e6d6e4d921a804f2a1f0

SHA1
ae9c4ad43f17cd32218b5404b1579f0335446f53

SHA256
a048b5cfd42730f584deee26eefa131545a1828d88c385c9826ca353b05bcc43

SHA512
88e8dc36c69677751dd4c53ceaf79ff5ba680e8d7e479e6c104a90b9cb8392623dd699a9a3929831d79da5be96d00391eb641ccfa3eac87094f917166c895a24

Download Submit
C:\Users\Admin\AppData\Roaming\vchostruntime.exe

Filesize
61KB

MD5
84d4fae51d1aeb8b522af9b741f3f70d

SHA1
18e856409dba60904d45f5dd91550e87e08c5a79

SHA256
3817f21f7736ee1d5b45875d8d78e3864a8ac0356bcddfa07a06e9daa4f31b94

SHA512
c26b5879efcd2d61672ab0b309e64ebefbbfc6de1298dae9ff39042e7d5291bfa2646740fcd3f20c40db62ac5e05664fd6c63ed556ae2cbd4c1d31d07b695213

Download Submit
memory/668-16-0x0000000000470000-0x0000000000486000-memory.dmp

Filesize
88KB

Download
memory/668-19-0x00007FFA03FC0000-0x00007FFA04A81000-memory.dmp

Filesize
10.8MB

Download
memory/668-70-0x00007FFA03FC0000-0x00007FFA04A81000-memory.dmp

Filesize
10.8MB

Download
memory/668-71-0x00007FFA03FC0000-0x00007FFA04A81000-memory.dmp

Filesize
10.8MB

Download
memory/668-72-0x00007FFA03FC0000-0x00007FFA04A81000-memory.dmp

Filesize
10.8MB

Download
memory/1856-0-0x00007FFA03FC3000-0x00007FFA03FC5000-memory.dmp

Filesize
8KB

Download
memory/1856-1-0x0000000000670000-0x00000000006A6000-memory.dmp

Filesize
216KB

Download
memory/4140-20-0x000002B832030000-0x000002B832052000-memory.dmp

Filesize
136KB

Download

Analysis

Sharing