isrstealer | 7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364

Analysis

max time kernel
42s
max time network
45s
platform
windows7_x64
resource
win7-20220812-en
resource tags

arch:x64arch:x86image:win7-20220812-enlocale:en-usos:windows7-x64system
submitted
03-12-2022 06:28

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General

Target

7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe
Size

2.6MB
MD5

b2894f2cbe96e7354f45c92dbc81a6b2
SHA1

c11da9d91173628a9557e9a7950f6b1504afd8db
SHA256

7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364
SHA512

d44011b7f32b06f1d702c9270b106642a7b5c25fd15764cafb14f2dcf2ba6e1909b2b873bede3d9dee627843fa2733e18042f7e267dc5fa7a27835b87ed3fdf4
SSDEEP

24576:YHYxbvHwDr6Y/Hicgp/lUBXHYxbvHwDr6Y/Hicgp/lUBhshRdrEAbm4z:Y4xcD/6h0BX4xcD/6h0BhydYAm4z

Score

10^/10

isrstealer collection spyware stealer trojan upx

Malware Config

Signatures

ISR Stealer
ISR Stealer is a modified version of Hackhound Stealer written in visual basic.
trojan stealer isrstealer

ISR Stealer payload 7 IoCs

resource	yara_rule
behavioral1/files/0x00090000000122fa-69.dat	family_isrstealer
behavioral1/files/0x00090000000122fa-72.dat	family_isrstealer
behavioral1/files/0x00090000000122fa-75.dat	family_isrstealer
behavioral1/files/0x00090000000122fa-82.dat	family_isrstealer
behavioral1/files/0x00090000000122fa-87.dat	family_isrstealer
behavioral1/files/0x00090000000122fa-95.dat	family_isrstealer
behavioral1/files/0x00090000000122fa-94.dat	family_isrstealer

NirSoft MailPassView 5 IoCs

Password recovery tool for various email clients

resource	yara_rule
behavioral1/memory/1372-102-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1228-104-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1372-105-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1228-108-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView
behavioral1/memory/1372-107-0x0000000000400000-0x000000000041F000-memory.dmp	MailPassView

Nirsoft 5 IoCs

resource	yara_rule
behavioral1/memory/1372-102-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1228-104-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1372-105-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1228-108-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft
behavioral1/memory/1372-107-0x0000000000400000-0x000000000041F000-memory.dmp	Nirsoft

Executes dropped EXE 8 IoCs

pid	Process
900	sermini.exe
964	sermini.exe
2000	Server.exe
1992	Server.exe
1696	Server.exe
1436	Server.exe
1228	Server.exe
1372	Server.exe

UPX packed file 12 IoCs

Detects executables packed with UPX/modified UPX open source packer.

upx

resource	yara_rule
behavioral1/memory/1992-73-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1992-79-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1992-81-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1992-89-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1228-90-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1228-100-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1372-102-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1228-104-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1372-105-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1992-106-0x0000000000400000-0x0000000000453000-memory.dmp	upx
behavioral1/memory/1228-108-0x0000000000400000-0x000000000041F000-memory.dmp	upx
behavioral1/memory/1372-107-0x0000000000400000-0x000000000041F000-memory.dmp	upx

Loads dropped DLL 4 IoCs

pid	Process
1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe
1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe
1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe
1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.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
T1081

Accesses Microsoft Outlook accounts 1 TTPs 2 IoCs

collection

Email Collection

T1114

description	ioc	Process
Key opened	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Server.exe
Key opened	\REGISTRY\USER\S-1-5-21-2292972927-2705560509-2768824231-1000\Software\Microsoft\Office\Outlook\OMI Account Manager\Accounts	Server.exe

Suspicious use of SetThreadContext 4 IoCs

description	pid	Process	procid_target
PID 2000 set thread context of 1992	2000	Server.exe	31
PID 1696 set thread context of 1436	1696	Server.exe	33
PID 1696 set thread context of 1228	1696	Server.exe	35
PID 2000 set thread context of 1372	2000	Server.exe	34

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

System Information Discovery
T1082

Suspicious use of AdjustPrivilegeToken 1 IoCs

description	pid	Process
Token: SeDebugPrivilege	1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe

Suspicious use of SetWindowsHookEx 2 IoCs

pid	Process
2000	Server.exe
1696	Server.exe

Suspicious use of WriteProcessMemory 52 IoCs

description	pid	Process	procid_target
PID 1520 wrote to memory of 900	1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe	28
PID 1520 wrote to memory of 900	1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe	28
PID 1520 wrote to memory of 900	1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe	28
PID 1520 wrote to memory of 900	1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe	28
PID 1520 wrote to memory of 964	1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe	29
PID 1520 wrote to memory of 964	1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe	29
PID 1520 wrote to memory of 964	1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe	29
PID 1520 wrote to memory of 964	1520	7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe	29
PID 900 wrote to memory of 2000	900	sermini.exe	30
PID 900 wrote to memory of 2000	900	sermini.exe	30
PID 900 wrote to memory of 2000	900	sermini.exe	30
PID 900 wrote to memory of 2000	900	sermini.exe	30
PID 2000 wrote to memory of 1992	2000	Server.exe	31
PID 2000 wrote to memory of 1992	2000	Server.exe	31
PID 2000 wrote to memory of 1992	2000	Server.exe	31
PID 2000 wrote to memory of 1992	2000	Server.exe	31
PID 2000 wrote to memory of 1992	2000	Server.exe	31
PID 2000 wrote to memory of 1992	2000	Server.exe	31
PID 2000 wrote to memory of 1992	2000	Server.exe	31
PID 2000 wrote to memory of 1992	2000	Server.exe	31
PID 2000 wrote to memory of 1992	2000	Server.exe	31
PID 964 wrote to memory of 1696	964	sermini.exe	32
PID 964 wrote to memory of 1696	964	sermini.exe	32
PID 964 wrote to memory of 1696	964	sermini.exe	32
PID 964 wrote to memory of 1696	964	sermini.exe	32
PID 1696 wrote to memory of 1436	1696	Server.exe	33
PID 1696 wrote to memory of 1436	1696	Server.exe	33
PID 1696 wrote to memory of 1436	1696	Server.exe	33
PID 1696 wrote to memory of 1436	1696	Server.exe	33
PID 1696 wrote to memory of 1436	1696	Server.exe	33
PID 1696 wrote to memory of 1436	1696	Server.exe	33
PID 1696 wrote to memory of 1436	1696	Server.exe	33
PID 1696 wrote to memory of 1436	1696	Server.exe	33
PID 1696 wrote to memory of 1436	1696	Server.exe	33
PID 1696 wrote to memory of 1228	1696	Server.exe	35
PID 1696 wrote to memory of 1228	1696	Server.exe	35
PID 1696 wrote to memory of 1228	1696	Server.exe	35
PID 1696 wrote to memory of 1228	1696	Server.exe	35
PID 1696 wrote to memory of 1228	1696	Server.exe	35
PID 1696 wrote to memory of 1228	1696	Server.exe	35
PID 1696 wrote to memory of 1228	1696	Server.exe	35
PID 1696 wrote to memory of 1228	1696	Server.exe	35
PID 2000 wrote to memory of 1372	2000	Server.exe	34
PID 2000 wrote to memory of 1372	2000	Server.exe	34
PID 2000 wrote to memory of 1372	2000	Server.exe	34
PID 2000 wrote to memory of 1372	2000	Server.exe	34
PID 2000 wrote to memory of 1372	2000	Server.exe	34
PID 2000 wrote to memory of 1372	2000	Server.exe	34
PID 2000 wrote to memory of 1372	2000	Server.exe	34
PID 2000 wrote to memory of 1372	2000	Server.exe	34
PID 1696 wrote to memory of 1228	1696	Server.exe	35
PID 2000 wrote to memory of 1372	2000	Server.exe	34

C:\Users\Admin\AppData\Local\Temp\7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe
"C:\Users\Admin\AppData\Local\Temp\7b5f23eeaa859056b764e21e1749980f40ab2a2237d4b7feb6c9f2574ad81364.exe"
1⤵
- Loads dropped DLL
- Suspicious use of AdjustPrivilegeToken
- Suspicious use of WriteProcessMemory
PID:1520
- C:\Users\Admin\AppData\Local\Temp\sermini.exe
  "C:\Users\Admin\AppData\Local\Temp\sermini.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:900
- - C:\Users\Admin\AppData\Roaming\Server.exe
    "C:\Users\Admin\AppData\Roaming\Server.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:2000
  - - C:\Users\Admin\AppData\Roaming\Server.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\PT91KVwAbt.ini"
      4⤵
      Executes dropped EXE
      PID:1992
  - - C:\Users\Admin\AppData\Roaming\Server.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\4iOREXLdmk.ini"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      PID:1372
- C:\Users\Admin\AppData\Local\Temp\sermini.exe
  "C:\Users\Admin\AppData\Local\Temp\sermini.exe"
  2⤵
  - Executes dropped EXE
  - Suspicious use of WriteProcessMemory
  PID:964
- - C:\Users\Admin\AppData\Roaming\Server.exe
    "C:\Users\Admin\AppData\Roaming\Server.exe"
    3⤵
    - Executes dropped EXE
    - Suspicious use of SetThreadContext
    - Suspicious use of SetWindowsHookEx
    - Suspicious use of WriteProcessMemory
    PID:1696
  - - C:\Users\Admin\AppData\Roaming\Server.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\aWExuZHbu3.ini"
      4⤵
      Executes dropped EXE
      PID:1436
  - - C:\Users\Admin\AppData\Roaming\Server.exe
      /scomma "C:\Users\Admin\AppData\Local\Temp\4iOREXLdmk.ini"
      4⤵
      Executes dropped EXE
      Accesses Microsoft Outlook accounts
      PID:1228

Network

MITRE ATT&CK Enterprise v6

Initial Access

Execution

Persistence

Privilege Escalation

Defense Evasion

Credential Access

Credentials in Files

T1081

Discovery

System Information Discovery

T1082

Lateral Movement

Collection

Data from Local System

T1005

Email Collection

T1114

Command and Control

Exfiltration

Impact

Replay Monitor

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Downloads

C:\Users\Admin\AppData\Local\Temp\sermini.exe

Filesize
1.2MB

MD5
45d775dc475cd0fe65d96e57beb58acd

SHA1
93491ac5bb503a1022e2004e0b5ff0434f9bcea1

SHA256
7797c2591a0051b65422b5919ecf9764b0e8f601cea40fe1afa21985d8216a0e

SHA512
3394c1e0612c3514afd711c0ddb8098b61c54494177d8df757e0cb6b2ff12ed058151d16bfc3d6913d9624b268e64114f914d4003db99f69357f5696e26cb621

Download Submit
C:\Users\Admin\AppData\Local\Temp\sermini.exe

Filesize
1.2MB

MD5
45d775dc475cd0fe65d96e57beb58acd

SHA1
93491ac5bb503a1022e2004e0b5ff0434f9bcea1

SHA256
7797c2591a0051b65422b5919ecf9764b0e8f601cea40fe1afa21985d8216a0e

SHA512
3394c1e0612c3514afd711c0ddb8098b61c54494177d8df757e0cb6b2ff12ed058151d16bfc3d6913d9624b268e64114f914d4003db99f69357f5696e26cb621

Download Submit
C:\Users\Admin\AppData\Local\Temp\sermini.exe

Filesize
1.2MB

MD5
45d775dc475cd0fe65d96e57beb58acd

SHA1
93491ac5bb503a1022e2004e0b5ff0434f9bcea1

SHA256
7797c2591a0051b65422b5919ecf9764b0e8f601cea40fe1afa21985d8216a0e

SHA512
3394c1e0612c3514afd711c0ddb8098b61c54494177d8df757e0cb6b2ff12ed058151d16bfc3d6913d9624b268e64114f914d4003db99f69357f5696e26cb621

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

Filesize
260KB

MD5
339e91d3f17423499c0f387b45c8b460

SHA1
7bc91865d6a1477d2a7461d2e9347e77e17107ed

SHA256
03ec9e4d5f402f7d7397652e68530ca6a390c0c396a8677e2b3416af66bcf526

SHA512
2cd0fea98d45f85e8358c51bc49b78bf9fe448231c0ac9c56bf4accb2a0ea8f21e8434065b082125972e95b48c931acc2938ddaac7f0b5f151623536bd44066b

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

Filesize
260KB

MD5
339e91d3f17423499c0f387b45c8b460

SHA1
7bc91865d6a1477d2a7461d2e9347e77e17107ed

SHA256
03ec9e4d5f402f7d7397652e68530ca6a390c0c396a8677e2b3416af66bcf526

SHA512
2cd0fea98d45f85e8358c51bc49b78bf9fe448231c0ac9c56bf4accb2a0ea8f21e8434065b082125972e95b48c931acc2938ddaac7f0b5f151623536bd44066b

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

Filesize
260KB

MD5
339e91d3f17423499c0f387b45c8b460

SHA1
7bc91865d6a1477d2a7461d2e9347e77e17107ed

SHA256
03ec9e4d5f402f7d7397652e68530ca6a390c0c396a8677e2b3416af66bcf526

SHA512
2cd0fea98d45f85e8358c51bc49b78bf9fe448231c0ac9c56bf4accb2a0ea8f21e8434065b082125972e95b48c931acc2938ddaac7f0b5f151623536bd44066b

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

Filesize
260KB

MD5
339e91d3f17423499c0f387b45c8b460

SHA1
7bc91865d6a1477d2a7461d2e9347e77e17107ed

SHA256
03ec9e4d5f402f7d7397652e68530ca6a390c0c396a8677e2b3416af66bcf526

SHA512
2cd0fea98d45f85e8358c51bc49b78bf9fe448231c0ac9c56bf4accb2a0ea8f21e8434065b082125972e95b48c931acc2938ddaac7f0b5f151623536bd44066b

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

Filesize
260KB

MD5
339e91d3f17423499c0f387b45c8b460

SHA1
7bc91865d6a1477d2a7461d2e9347e77e17107ed

SHA256
03ec9e4d5f402f7d7397652e68530ca6a390c0c396a8677e2b3416af66bcf526

SHA512
2cd0fea98d45f85e8358c51bc49b78bf9fe448231c0ac9c56bf4accb2a0ea8f21e8434065b082125972e95b48c931acc2938ddaac7f0b5f151623536bd44066b

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

Filesize
260KB

MD5
339e91d3f17423499c0f387b45c8b460

SHA1
7bc91865d6a1477d2a7461d2e9347e77e17107ed

SHA256
03ec9e4d5f402f7d7397652e68530ca6a390c0c396a8677e2b3416af66bcf526

SHA512
2cd0fea98d45f85e8358c51bc49b78bf9fe448231c0ac9c56bf4accb2a0ea8f21e8434065b082125972e95b48c931acc2938ddaac7f0b5f151623536bd44066b

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

Filesize
260KB

MD5
339e91d3f17423499c0f387b45c8b460

SHA1
7bc91865d6a1477d2a7461d2e9347e77e17107ed

SHA256
03ec9e4d5f402f7d7397652e68530ca6a390c0c396a8677e2b3416af66bcf526

SHA512
2cd0fea98d45f85e8358c51bc49b78bf9fe448231c0ac9c56bf4accb2a0ea8f21e8434065b082125972e95b48c931acc2938ddaac7f0b5f151623536bd44066b

Download Submit
\Users\Admin\AppData\Local\Temp\sermini.exe

Filesize
1.2MB

MD5
45d775dc475cd0fe65d96e57beb58acd

SHA1
93491ac5bb503a1022e2004e0b5ff0434f9bcea1

SHA256
7797c2591a0051b65422b5919ecf9764b0e8f601cea40fe1afa21985d8216a0e

SHA512
3394c1e0612c3514afd711c0ddb8098b61c54494177d8df757e0cb6b2ff12ed058151d16bfc3d6913d9624b268e64114f914d4003db99f69357f5696e26cb621

Download Submit
\Users\Admin\AppData\Local\Temp\sermini.exe

Filesize
1.2MB

MD5
45d775dc475cd0fe65d96e57beb58acd

SHA1
93491ac5bb503a1022e2004e0b5ff0434f9bcea1

SHA256
7797c2591a0051b65422b5919ecf9764b0e8f601cea40fe1afa21985d8216a0e

SHA512
3394c1e0612c3514afd711c0ddb8098b61c54494177d8df757e0cb6b2ff12ed058151d16bfc3d6913d9624b268e64114f914d4003db99f69357f5696e26cb621

Download Submit
\Users\Admin\AppData\Local\Temp\sermini.exe

Filesize
1.2MB

MD5
45d775dc475cd0fe65d96e57beb58acd

SHA1
93491ac5bb503a1022e2004e0b5ff0434f9bcea1

SHA256
7797c2591a0051b65422b5919ecf9764b0e8f601cea40fe1afa21985d8216a0e

SHA512
3394c1e0612c3514afd711c0ddb8098b61c54494177d8df757e0cb6b2ff12ed058151d16bfc3d6913d9624b268e64114f914d4003db99f69357f5696e26cb621

Download Submit
\Users\Admin\AppData\Local\Temp\sermini.exe

Filesize
1.2MB

MD5
45d775dc475cd0fe65d96e57beb58acd

SHA1
93491ac5bb503a1022e2004e0b5ff0434f9bcea1

SHA256
7797c2591a0051b65422b5919ecf9764b0e8f601cea40fe1afa21985d8216a0e

SHA512
3394c1e0612c3514afd711c0ddb8098b61c54494177d8df757e0cb6b2ff12ed058151d16bfc3d6913d9624b268e64114f914d4003db99f69357f5696e26cb621

Download Submit
memory/900-67-0x000007FEFB801000-0x000007FEFB803000-memory.dmp

Filesize
8KB

Download
memory/900-65-0x000007FEF3410000-0x000007FEF3E33000-memory.dmp

Filesize
10.1MB

Download
memory/964-66-0x000007FEF3410000-0x000007FEF3E33000-memory.dmp

Filesize
10.1MB

Download
memory/1228-90-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1228-100-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1228-108-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1228-104-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1372-107-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1372-105-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1372-102-0x0000000000400000-0x000000000041F000-memory.dmp

Filesize
124KB

Download
memory/1520-55-0x0000000074D61000-0x0000000074D63000-memory.dmp

Filesize
8KB

Download
memory/1520-54-0x0000000000B30000-0x0000000000DCC000-memory.dmp

Filesize
2.6MB

Download
memory/1992-79-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1992-89-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1992-73-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

Download
memory/1992-106-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

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memory/1992-81-0x0000000000400000-0x0000000000453000-memory.dmp

Filesize
332KB

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