xworm | 2721b3feda88f242a54f83dfcd50d6356ae11a4374a816790cc90c00eb990ba1

General

Target

2721b3feda88f242a54f83dfcd50d6356ae11a4374a816790cc90c00eb990ba1.exe
Size

724KB
MD5

6e1e63e97c09758e3db18ea31bd95284
SHA1

6f4a188d43122d22a14459123764a094ed56b37c
SHA256

2721b3feda88f242a54f83dfcd50d6356ae11a4374a816790cc90c00eb990ba1
SHA512

0708ebbc263c5f16fddb0e1e76abf30b3ff5842207f450e0892e0879f828ecf165a203f156f460ed3cb97dd85691c0f3dc2233160b98e7daf34057872c70ba23
SSDEEP

12288:7DeaBr2968/mPSxX7UydfxMApCPuiRMfOzzH3t2zrNkjovC7Qe1RwUdaZkgsZyL:3Pp8/2Sx/xMA8miRSO3H3t8aDaXs8

Score

10^/10

xworm execution rat trojan

Malware Config

Extracted

Family

xworm

Version

5.0

C2

45.141.27.41:7000

Mutex

9ZF9ZsOZGh1T1r1n

Attributes

Install_directory
%Public%
install_file
csrss.exe

aes.plain

Signatures

Detect Xworm Payload 2 IoCs

resource	yara_rule
behavioral2/files/0x0007000000023413-23.dat	family_xworm
behavioral2/memory/3644-48-0x0000000000EA0000-0x0000000000EB0000-memory.dmp	family_xworm

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

Detects Windows executables referencing non-Windows User-Agents 2 IoCs

resource	yara_rule
behavioral2/files/0x0007000000023413-23.dat	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA
behavioral2/memory/3644-48-0x0000000000EA0000-0x0000000000EB0000-memory.dmp	INDICATOR_SUSPICIOUS_EXE_NoneWindowsUA

Detects executables (downlaoders) containing URLs to raw contents of a paste 1 IoCs

resource	yara_rule
behavioral2/files/0x000900000002340a-6.dat	INDICATOR_SUSPICIOUS_EXE_RawPaste_URL

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
1980	powershell.exe
4844	powershell.exe
1592	powershell.exe
5024	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-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	2721b3feda88f242a54f83dfcd50d6356ae11a4374a816790cc90c00eb990ba1.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1337824034-2731376981-3755436523-1000\Control Panel\International\Geo\Nation	XClient.exe

Drops startup file 2 IoCs

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

Executes dropped EXE 2 IoCs

pid	Process
1656	example.exe
3644	XClient.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.

flow	ioc
32	ip-api.com

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

System Information Discovery
T1082

Suspicious behavior: EnumeratesProcesses 19 IoCs

pid	Process
1656	example.exe
1656	example.exe
1656	example.exe
1656	example.exe
1656	example.exe
1656	example.exe
1656	example.exe
1656	example.exe
1656	example.exe
1656	example.exe
4844	powershell.exe
4844	powershell.exe
1592	powershell.exe
1592	powershell.exe
5024	powershell.exe
5024	powershell.exe
1980	powershell.exe
1980	powershell.exe
3644	XClient.exe

Suspicious use of AdjustPrivilegeToken 6 IoCs

description	pid	Process
Token: SeDebugPrivilege	3644	XClient.exe
Token: SeDebugPrivilege	4844	powershell.exe
Token: SeDebugPrivilege	1592	powershell.exe
Token: SeDebugPrivilege	5024	powershell.exe
Token: SeDebugPrivilege	1980	powershell.exe
Token: SeDebugPrivilege	3644	XClient.exe

Suspicious use of SetWindowsHookEx 1 IoCs

pid	Process
3644	XClient.exe

Suspicious use of WriteProcessMemory 20 IoCs

description	pid	Process	procid_target
PID 936 wrote to memory of 1656	936	2721b3feda88f242a54f83dfcd50d6356ae11a4374a816790cc90c00eb990ba1.exe	83
PID 936 wrote to memory of 1656	936	2721b3feda88f242a54f83dfcd50d6356ae11a4374a816790cc90c00eb990ba1.exe	83
PID 936 wrote to memory of 3644	936	2721b3feda88f242a54f83dfcd50d6356ae11a4374a816790cc90c00eb990ba1.exe	85
PID 936 wrote to memory of 3644	936	2721b3feda88f242a54f83dfcd50d6356ae11a4374a816790cc90c00eb990ba1.exe	85
PID 1656 wrote to memory of 4964	1656	example.exe	86
PID 1656 wrote to memory of 4964	1656	example.exe	86
PID 4964 wrote to memory of 5096	4964	cmd.exe	87
PID 4964 wrote to memory of 5096	4964	cmd.exe	87
PID 4964 wrote to memory of 4832	4964	cmd.exe	88
PID 4964 wrote to memory of 4832	4964	cmd.exe	88
PID 4964 wrote to memory of 4584	4964	cmd.exe	89
PID 4964 wrote to memory of 4584	4964	cmd.exe	89
PID 3644 wrote to memory of 4844	3644	XClient.exe	95
PID 3644 wrote to memory of 4844	3644	XClient.exe	95
PID 3644 wrote to memory of 1592	3644	XClient.exe	97
PID 3644 wrote to memory of 1592	3644	XClient.exe	97
PID 3644 wrote to memory of 5024	3644	XClient.exe	99
PID 3644 wrote to memory of 5024	3644	XClient.exe	99
PID 3644 wrote to memory of 1980	3644	XClient.exe	101
PID 3644 wrote to memory of 1980	3644	XClient.exe	101

C:\Users\Admin\AppData\Local\Temp\2721b3feda88f242a54f83dfcd50d6356ae11a4374a816790cc90c00eb990ba1.exe
"C:\Users\Admin\AppData\Local\Temp\2721b3feda88f242a54f83dfcd50d6356ae11a4374a816790cc90c00eb990ba1.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:936
- C:\Users\Admin\example.exe
  "C:\Users\Admin\example.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of WriteProcessMemory
  PID:1656
- - C:\Windows\system32\cmd.exe
    C:\Windows\system32\cmd.exe /c certutil -hashfile "C:\Users\Admin\example.exe" MD5 | find /i /v "md5" | find /i /v "certutil"
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4964
  - - C:\Windows\system32\certutil.exe
      certutil -hashfile "C:\Users\Admin\example.exe" MD5
      4⤵
      PID:5096
  - - C:\Windows\system32\find.exe
      find /i /v "md5"
      4⤵
      PID:4832
  - - C:\Windows\system32\find.exe
      find /i /v "certutil"
      4⤵
      PID:4584
- C:\Users\Admin\XClient.exe
  "C:\Users\Admin\XClient.exe"
  2⤵
  - Checks computer location settings
  - Drops startup file
  - Executes dropped EXE
  - Suspicious behavior: EnumeratesProcesses
  - Suspicious use of AdjustPrivilegeToken
  - Suspicious use of SetWindowsHookEx
  - Suspicious use of WriteProcessMemory
  PID:3644
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Admin\XClient.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:4844
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'XClient.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1592
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionPath 'C:\Users\Public\csrss.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:5024
- - C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe
    "C:\Windows\System32\WindowsPowerShell\v1.0\powershell.exe" -ExecutionPolicy Bypass Add-MpPreference -ExclusionProcess 'csrss.exe'
    3⤵
    - Command and Scripting Interpreter: PowerShell
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    PID:1980

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

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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
6d42b6da621e8df5674e26b799c8e2aa

SHA1
ab3ce1327ea1eeedb987ec823d5e0cb146bafa48

SHA256
5ab6a1726f425c6d0158f55eb8d81754ddedd51e651aa0a899a29b7a58619c4c

SHA512
53faffbda8a835bc1143e894c118c15901a5fd09cfc2224dd2f754c06dc794897315049a579b9a8382d4564f071576045aaaf824019b7139d939152dca38ce29

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

Filesize
944B

MD5
10890cda4b6eab618e926c4118ab0647

SHA1
1e1d63b73a0e6c7575f458b3c7917a9ce5ba776d

SHA256
00f8a035324d39bd62e6dee5e1b480069015471c487ebee4479e6990ea9ddb14

SHA512
a2ee84006c24a36f25e0bca0772430d64e3791f233da916aecdeae6712763e77d55bbbd00dc8f6b2b3887f3c26ab3980b96c5f46cc823e81e28abbbc5fc78221

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

Filesize
944B

MD5
ba657a1edd51b4961f80ca72ab106dfd

SHA1
ecb0b535f2d1d2c9d6ff7b5533393bd00dafbbf0

SHA256
1c15ab24ff0993eebffca016396c8cc2fff639c31640acbe36b4bcb3f2888349

SHA512
f78074f599cbb9c43611083b95fd290dc74aef1c92fbbb8aee0b2ef335a7fcbcb43742381275aa4d2160c9f7c0920999c8acaba20f0652bfec5e2493aaa85699

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_vvt0an5r.ns4.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\XClient.exe

Filesize
40KB

MD5
7ea387ab126b2ecf3365d448a318a433

SHA1
71b6e05898b68ed72ca95266d6293b225c40b612

SHA256
573f3d316ed68ea2d4762a657dcc62416b763a8fcd1f99017f02d3ef5c215015

SHA512
68830f84bf9f0a9e75a999907f7e7d816f89aa745e92078f56f303edadb236e14957e0594290f297fd4c0175ae72be02542cabe974a404fe961b7ab4bf945825

Download Submit
C:\Users\Admin\example.exe

Filesize
673KB

MD5
56a9b5d3e447355a8d29a2d02a00b70c

SHA1
af802aab037d6ae208b040e4e0b629665f208394

SHA256
8d33c98d8aa62cbcc5d9096aa93fe073f0ee012af6cea9f19daad0d8e08d0ff1

SHA512
c9d4de01e7c472d48ecee70777cac1f3ab3959fdb863c27096898b339e5f53e319489080ca08d3b18659ab396a16a18638fbebe06e58546ddeb2b5b5ca593081

Download Submit
memory/936-0-0x00007FF947473000-0x00007FF947475000-memory.dmp

Filesize
8KB

Download
memory/936-1-0x00000000005C0000-0x000000000067C000-memory.dmp

Filesize
752KB

Download
memory/3644-51-0x00007FF947470000-0x00007FF947F31000-memory.dmp

Filesize
10.8MB

Download
memory/3644-50-0x00007FF947470000-0x00007FF947F31000-memory.dmp

Filesize
10.8MB

Download
memory/3644-48-0x0000000000EA0000-0x0000000000EB0000-memory.dmp

Filesize
64KB

Download
memory/3644-102-0x00007FF947470000-0x00007FF947F31000-memory.dmp

Filesize
10.8MB

Download
memory/3644-103-0x00007FF947470000-0x00007FF947F31000-memory.dmp

Filesize
10.8MB

Download
memory/4844-57-0x0000023565630000-0x0000023565652000-memory.dmp

Filesize
136KB

Download

Analysis

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