gurcu | fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

Analysis

max time kernel
14s
max time network
74s
platform
windows10-2004_x64
resource
win10v2004-20230703-en
resource tags

arch:x64arch:x86image:win10v2004-20230703-enlocale:en-usos:windows10-2004-x64system
submitted
26-07-2023 13:31

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General

Target

build_4.exe
Size

165KB
MD5

547933c1a8ea0eb111e619d70ca2c657
SHA1

aca394a095c3951ace115ac621a67df1ff4d2e33
SHA256

fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea
SHA512

5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b
SSDEEP

1536:ROwwIJbzij3pPEOGFmd8Szav8IDYFUxT1DR5jPVSBSVG41AG9wL4yXacCwPIC6Xi:RyIlz2p8Yai3GNzDeeb4FzeDGwKSHqj

Score

10^/10

gurcu spyware stealer

Malware Config

Extracted

Family

gurcu

https://api.telegram.org/bot6193093056:AAHzyNGUGS9aUG6CCx6ENLoXpCFLzEQywIQ/sendMessage?chat_id=1098292643

Signatures

Gurcu, WhiteSnake
Gurcu is a malware stealer written in C#.
stealer gurcu

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-1-5-21-1420546310-613437930-2990200354-1000\Control Panel\International\Geo\Nation	build_4.exe
Key value queried	\REGISTRY\USER\S-1-5-21-1420546310-613437930-2990200354-1000\Control Panel\International\Geo\Nation	build_4.exe

Executes dropped EXE 3 IoCs

pid	Process
4864	build_4.exe
2692	tor.exe
2936	build_4.exe

Reads user/profile data of web browsers 2 TTPs
Infostealers often target stored browser data, which can include saved credentials etc.
spyware stealer

Data from Local System
T1005

Credentials In Files
T1552.001

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
27	ip-api.com

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

System Information Discovery
T1082

Creates scheduled task(s) 1 TTPs 1 IoCs

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

persistence

Scheduled Task/Job

T1053

pid	Process
3968	schtasks.exe

Runs ping.exe 1 TTPs 1 IoCs

Remote System Discovery

T1018

pid	Process
2848	PING.EXE

Suspicious behavior: EnumeratesProcesses 1 IoCs

pid	Process
4864	build_4.exe

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	4864	build_4.exe

Suspicious use of WriteProcessMemory 14 IoCs

description	pid	Process	procid_target
PID 3624 wrote to memory of 1356	3624	build_4.exe	86
PID 3624 wrote to memory of 1356	3624	build_4.exe	86
PID 1356 wrote to memory of 2396	1356	cmd.exe	87
PID 1356 wrote to memory of 2396	1356	cmd.exe	87
PID 1356 wrote to memory of 2848	1356	cmd.exe	88
PID 1356 wrote to memory of 2848	1356	cmd.exe	88
PID 1356 wrote to memory of 3968	1356	cmd.exe	92
PID 1356 wrote to memory of 3968	1356	cmd.exe	92
PID 1356 wrote to memory of 4864	1356	cmd.exe	93
PID 1356 wrote to memory of 4864	1356	cmd.exe	93
PID 4864 wrote to memory of 2312	4864	build_4.exe	96
PID 4864 wrote to memory of 2312	4864	build_4.exe	96
PID 4864 wrote to memory of 2692	4864	build_4.exe	99
PID 4864 wrote to memory of 2692	4864	build_4.exe	99

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\build_4.exe
"C:\Users\Admin\AppData\Local\Temp\build_4.exe"
1⤵
- Checks computer location settings
- Suspicious use of WriteProcessMemory
PID:3624
- C:\Windows\System32\cmd.exe
  "C:\Windows\System32\cmd.exe" /C chcp 65001 && ping 127.0.0.1 && schtasks /create /tn "build_4" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe" /rl HIGHEST /f && DEL /F /S /Q /A "C:\Users\Admin\AppData\Local\Temp\build_4.exe" &&START "" "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe"
  2⤵
  - Suspicious use of WriteProcessMemory
  PID:1356
- - C:\Windows\system32\chcp.com
    chcp 65001
    3⤵
    PID:2396
- - C:\Windows\system32\PING.EXE
    ping 127.0.0.1
    3⤵
    - Runs ping.exe
    PID:2848
- - C:\Windows\system32\schtasks.exe
    schtasks /create /tn "build_4" /sc MINUTE /tr "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe" /rl HIGHEST /f
    3⤵
    - Creates scheduled task(s)
    PID:3968
- - C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
    "C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe"
    3⤵
    - Checks computer location settings
    - Executes dropped EXE
    - Suspicious behavior: EnumeratesProcesses
    - Suspicious use of AdjustPrivilegeToken
    - Suspicious use of WriteProcessMemory
    PID:4864
  - - C:\Windows\System32\tar.exe
      "C:\Windows\System32\tar.exe" -xvzf "C:\Users\Admin\AppData\Local\Temp\tmp99EE.tmp" -C "C:\Users\Admin\AppData\Local\d92pmiifqt"
      4⤵
      PID:2312
  - - C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe
      "C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe" -f "C:\Users\Admin\AppData\Local\d92pmiifqt\torrc.txt"
      4⤵
      Executes dropped EXE
      PID:2692

C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe
1⤵
- Executes dropped EXE
PID:2936

Network

MITRE ATT&CK Enterprise v15

Reconnaissance

Resource Development

Initial Access

Execution

Scheduled Task/Job

T1053

Persistence

Scheduled Task/Job

T1053

Privilege Escalation

Scheduled Task/Job

T1053

Defense Evasion

Credential Access

Unsecured Credentials

T1552

Credentials In Files

T1552.001

Discovery

Query Registry

T1012

Remote System Discovery

T1018

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Microsoft\CLR_v4.0\UsageLogs\build_4.exe.log

Filesize
847B

MD5
3308a84a40841fab7dfec198b3c31af7

SHA1
4e7ab6336c0538be5dd7da529c0265b3b6523083

SHA256
169bc31a8d1666535977ca170d246a463e6531bb21faab6c48cb4269d9d60b2e

SHA512
97521d5fb94efdc836ea2723098a1f26a7589a76af51358eee17292d29c9325baf53ad6b4496c5ca3e208d1c9b9ad6797a370e2ae378072fc68f5d6e8b73b198

Download Submit
C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

Filesize
165KB

MD5
547933c1a8ea0eb111e619d70ca2c657

SHA1
aca394a095c3951ace115ac621a67df1ff4d2e33

SHA256
fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

SHA512
5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

Download Submit
C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

Filesize
165KB

MD5
547933c1a8ea0eb111e619d70ca2c657

SHA1
aca394a095c3951ace115ac621a67df1ff4d2e33

SHA256
fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

SHA512
5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

Download Submit
C:\Users\Admin\AppData\Local\NET.Framework\build_4.exe

Filesize
165KB

MD5
547933c1a8ea0eb111e619d70ca2c657

SHA1
aca394a095c3951ace115ac621a67df1ff4d2e33

SHA256
fdc83f58a30b80240c5887c6646324600f3896421059b80caddacfdb196287ea

SHA512
5df1b41c5f19e304cc0758b175252c17cc6ccb1d3d91ba2f153138dfbd8e2ef3cd6efe8a136559c55952bdb43a7f206f7ba4e04674ee95363ca8409e48745c2b

Download Submit
C:\Users\Admin\AppData\Local\Temp\tmp99EE.tmp

Filesize
13.3MB

MD5
89d2d5811c1aff539bb355f15f3ddad0

SHA1
5bb3577c25b6d323d927200c48cd184a3e27c873

SHA256
b630008f6d3887793d48b87091e56691e292894dd4fa100dc4a418a2f29dcc12

SHA512
39e576124c54143520c5435a2ef9b24506131e13403489c0692f09b89135015d611c4988d4772f8a1e6557fa68b4667d467334461009cee8c2227dfc3e295289

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\data\cached-microdesc-consensus.tmp

Filesize
2.4MB

MD5
9c51572e470c337066703261d26f0828

SHA1
f8698e779dbfb6e768a73c283cf105147cfa5f36

SHA256
e69a860ddf121131d36f11b84359753b3c9991c488469345f6f0c6f4640afbf1

SHA512
3ac421923caec92941d7ba150669e1ebd975096263ced3f82e7bce9d80a0bf72f080158d40d8d4afcbd8512cf8d4d83056a981f2a7237dfc1312899dee743390

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\host\hostname

Filesize
64B

MD5
8fd12c735dcbc2c813b96daa1534d2e1

SHA1
c1ec8458a9f9ccb53cfe8b9f1194a8476ba4bd8e

SHA256
c395ede6bc68b23bfca363d514099ea0bee6eb7d06016dbb82cae66b7cf4c0b3

SHA512
73c1e511c1995e5eac0c9b7a0cb69d16530a871b3e09d429272ba40b61cc7cbb8b5875abbf38d57ee45c355e73e9fe615d7dfb266f3dde30c9b7d17fdd1133f2

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\tor\tor.exe

Filesize
7.4MB

MD5
88590909765350c0d70c6c34b1f31dd2

SHA1
129b27c3926e53e5df6d44cc6adf39c3a8d9ebf7

SHA256
46fe244b548265c78ab961e8f787bc8bf21edbcaaf175fa3b8be3137c6845a82

SHA512
a8af08d9169a31a1c3419d4e6e8fbe608c800d323840563b5a560d3e09e78a492201f07cc0d3864efbff8ad81e59885fc43a6b749e0a3377aa8555df258af192

Download Submit
C:\Users\Admin\AppData\Local\d92pmiifqt\torrc.txt

Filesize
218B

MD5
d8d2f1fb89b09bc19b8a6b409385c2ba

SHA1
7ffcc834b82f29f7450c31f23e63eff3f0f4c3a9

SHA256
0e81fe4f83b56bf75ca34cdb7d1ae4c3fd89930557495eba78898413513475b9

SHA512
f5ec1d984a5eb6981297622bdcba069f628e6ff3dee892ff9bdf056d269780c605e9ade5bcd9f4feb5f08d2680a07f77df9d30fe6b8b9695e98f34c69dc397fb

Download Submit
memory/3624-133-0x0000022ED2B80000-0x0000022ED2BB0000-memory.dmp

Filesize
192KB

Download
memory/3624-139-0x00007FFCEC6B0000-0x00007FFCED171000-memory.dmp

Filesize
10.8MB

Download
memory/3624-137-0x0000022ED4770000-0x0000022ED4780000-memory.dmp

Filesize
64KB

Download
memory/3624-136-0x00007FFCEC6B0000-0x00007FFCED171000-memory.dmp

Filesize
10.8MB

Download
memory/4864-145-0x0000024CE2440000-0x0000024CE2450000-memory.dmp

Filesize
64KB

Download
memory/4864-144-0x00007FFCEBD90000-0x00007FFCEC851000-memory.dmp

Filesize
10.8MB

Download
memory/4864-181-0x00007FFCEBD90000-0x00007FFCEC851000-memory.dmp

Filesize
10.8MB

Download